WO2017188201A1 - 保護膜形成用フィルム及び保護膜形成用複合シート - Google Patents
保護膜形成用フィルム及び保護膜形成用複合シート Download PDFInfo
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- WO2017188201A1 WO2017188201A1 PCT/JP2017/016259 JP2017016259W WO2017188201A1 WO 2017188201 A1 WO2017188201 A1 WO 2017188201A1 JP 2017016259 W JP2017016259 W JP 2017016259W WO 2017188201 A1 WO2017188201 A1 WO 2017188201A1
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L21/6836—Wafer tapes, e.g. grinding or dicing support tapes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/26—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers
- B32B2037/268—Release layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/538—Roughness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/748—Releasability
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68327—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
Definitions
- the present invention relates to a protective film-forming film and a protective film-forming composite sheet.
- a semiconductor device using a mounting method called a so-called face-down method has been manufactured.
- a semiconductor chip having electrodes such as bumps on a circuit surface is used, and the electrodes are bonded to a substrate. For this reason, the back surface opposite to the circuit surface of the semiconductor chip may be exposed.
- a resin film containing an organic material is formed as a protective film on the exposed back surface of the semiconductor chip, and may be taken into the semiconductor device as a semiconductor chip with a protective film.
- the protective film is used to prevent cracks from occurring in the semiconductor chip after the dicing process or packaging.
- a protective film-forming composite sheet comprising a protective film-forming film for forming a protective film on a support sheet is used.
- the protective film forming film can form a protective film by curing, and the support sheet can be used as a dicing sheet, and the protective film forming film and the dicing sheet are integrated. It is possible that
- a composite sheet for forming a protective film for example, a sheet provided with a thermosetting protective film forming film that forms a protective film by being cured by heating has been mainly used so far.
- a protective film-forming composite sheet is pasted to the back surface (surface opposite to the electrode-forming surface) of the semiconductor wafer with a thermosetting protective film-forming film, and then the protective film-forming film is heated.
- the semiconductor wafer is divided together with the protective film by dicing to form a semiconductor chip. Then, the semiconductor chip is picked up while being separated from the support sheet while the protective film is stuck.
- hardening and dicing of the film for protective film formation may be performed in the reverse order.
- thermosetting protective film-forming film since the heat curing of the thermosetting protective film-forming film usually takes a long time of about several hours, shortening of the curing time is desired.
- a protective film-forming film that can be cured by irradiation with energy rays such as ultraviolet rays has been studied.
- an energy ray curable protective film (see Patent Document 1) formed on a release film, and an energy ray curable chip protective film that can form a protective film having high hardness and excellent adhesion to a semiconductor chip (Patent Document) 2).
- the energy ray-curable protective film disclosed in Patent Document 1 has an appropriate adhesive force to the support sheet.
- tip protective film currently disclosed by patent document 2 is what was formed on the support sheet, it is not certain whether the adhesive force with respect to a support sheet is appropriate.
- the pick-up suitability of the protective film-forming films disclosed in Patent Documents 1 and 2 is unknown.
- the present invention includes an energy ray-curable protective film-forming film capable of forming a protective film on the back surface of a semiconductor wafer or semiconductor chip and having good pickability, and the protective film-forming film. It aims at providing the composite sheet for protective film formation.
- the present invention provides that when the protective film-forming film is irradiated with energy rays to form a protective film, the surface roughness (Ra) of at least one surface ( ⁇ ) of the protective film is 0.
- An energy ray-curable protective film-forming film having a thickness of 0.038 ⁇ m or more is provided.
- the surface ( ⁇ ) preferably has a surface roughness (Ra) of 1.5 ⁇ m or less.
- the present invention also provides a protective film-forming composite sheet comprising the protective film-forming film on a support sheet, wherein the surface ( ⁇ ) of the protective film-forming film faces the support sheet. To do.
- the composite film for protective film formation provided with the film for energy film-curable protective film formation which can form a protective film in the back surface of a semiconductor wafer or a semiconductor chip and has favorable pick-up property is provided. Is done.
- the protective film-forming film of the present invention is an energy ray-curable protective film-forming film, and when the protective film-forming film is irradiated with energy rays to form a protective film,
- the surface roughness (Ra) of at least one surface ( ⁇ ) of the protective film is 0.038 ⁇ m or more.
- the protective film-forming film of the present invention may have a first release film on at least one surface, and may further have a second release film on the other surface.
- the film for forming a protective film of the present invention can be provided as a long film wound in a roll shape.
- FIG. 3 is a cross-sectional view schematically showing one embodiment of the protective film-forming film of the present invention. In FIG.
- the 1st peeling film 15b, the film 13 (23) for protective film formation, and the 2nd peeling film 15a are laminated
- the surface to be attached to the back surface of the semiconductor wafer that is, the surface opposite to the circuit surface
- the surface opposite to the surface may be referred to as “surface ( ⁇ )”.
- the surface roughness (Ra) of at least one surface ( ⁇ ) is preferably 0.038 ⁇ m or more, and preferably 1.5 ⁇ m or less.
- One aspect of the present invention is a protective film-forming film for forming a protective film on the back surface of a semiconductor wafer or semiconductor chip, having energy ray curability, and the energy film is applied to the protective film-forming film.
- the surface roughness (Ra) of the surface ( ⁇ ) opposite to the surface ( ⁇ ) of the protective film on the side attached to the semiconductor wafer or semiconductor chip is 0.038 ⁇ m.
- the present invention relates to a protective film-forming film.
- the surface roughness (Ra) of the surface ( ⁇ ) on the side opposite to the surface ( ⁇ ) on the side attached to the semiconductor wafer or semiconductor chip is preferably 1.5 ⁇ m or less.
- a protective film-forming sheet comprising a first release film and a protective film-forming film that directly contacts the first release film and has energy ray curability
- the surface roughness (Ra) of the surface ( ⁇ ) of the protective film on the side in direct contact with the first release film is It is related with the sheet
- the surface roughness (Ra) of the surface ( ⁇ ) on the side attached to the first release film is preferably 1.5 ⁇ m or less.
- the surface roughness (Ra) of the surface of the first release film that is in direct contact with the surface ( ⁇ ) of the protective film-forming film is preferably 0.03 to 2.0 ⁇ m, More preferably, it is 1.8 ⁇ m.
- the protective film-forming film is directly laminated on the surface of the release film having such surface roughness (Ra)
- the protective film is irradiated with energy rays to form a protective film
- the surface roughness (Ra) of at least one surface ( ⁇ ) can be adjusted to 0.038 ⁇ m or more and 1.5 ⁇ m or less.
- the surface ( ⁇ ) opposite to the side where the first release film of the protective film-forming film is attached is attached to the back surface of the semiconductor wafer or semiconductor chip, and energy rays are applied to the protective film-forming film.
- the surface roughness (Ra) of the surface ( ⁇ ) of the protective film can be adjusted to 0.038 ⁇ m or more and 1.5 ⁇ m or less by peeling off the first release film by irradiation. .
- the surface roughness (Ra) of the surface ( ⁇ ) is preferably 0.038 to 1.5 ⁇ m, more preferably 0.04 to 1.47 ⁇ m, and 0.08 to 1 .47 ⁇ m is more preferable, and 0.8 to 1.43 ⁇ m is still more preferable.
- the surface roughness (Ra) of the surface ( ⁇ ) of the protective film-forming film can be measured by the measuring method described in the examples.
- the composite sheet for forming a protective film of the present invention comprises an energy ray-curable protective film-forming film on a support sheet, and the protective film-forming film is irradiated with energy rays.
- the surface roughness (Ra) of at least one surface ( ⁇ ) of the protective film is 0.038 ⁇ m or more.
- the surface ( ⁇ ) of the protective film-forming film faces the support sheet.
- the surface ( ⁇ ) of the protective film-forming film in the protective film-forming composite sheet of the present invention is preferably 0.038 ⁇ m or more, and preferably 1.5 ⁇ m or less.
- the surface roughness (Ra) of the surface ( ⁇ ) is preferably 0.038 to 1.5 ⁇ m, preferably 0.04 to 1. 47 ⁇ m is more preferable, 0.08 to 1.47 ⁇ m is more preferable, and 0.8 to 1.43 is still more preferable.
- the adhesive force between the protective film and the support sheet may be 50 to 1500 mN / 25 mm.
- the “protective film-forming film” means a film before curing, and the “protective film” means a film obtained by curing the protective film-forming film.
- the surface roughness (Ra) of the surface ( ⁇ ) of the protective film-forming film in the protective film-forming composite sheet can be measured by the measuring method described in the examples.
- the protective film-forming film is cured by irradiation with energy rays and becomes a protective film.
- This protective film is for protecting the back surface (surface opposite to the electrode forming surface) of the semiconductor wafer or semiconductor chip.
- the protective film-forming film is soft and can be easily attached to an object to be attached.
- the surface roughness (Ra) of at least one surface ( ⁇ ) of the protective film is 0.038 ⁇ m or more.
- the composite sheet for forming a protective film of the present invention has good pickability, and for example, can pick up a target semiconductor chip with high selectivity, and at this time, cracking and chipping of the semiconductor chip are suppressed.
- the protective film-forming composite sheet of the present invention the protective film-forming composite sheet of the conventional protective film-forming composite sheet provided with the thermosetting protective film-forming film is formed by the energy film-curable film.
- the protective film can be formed by curing in a shorter time than the case.
- “energy beam” means an electromagnetic wave or charged particle beam having energy quanta, and examples thereof include ultraviolet rays, radiation, and electron beams.
- Ultraviolet rays can be irradiated by using, for example, a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, a black light, an LED lamp or the like as an ultraviolet ray source.
- the electron beam can be emitted by an electron beam accelerator or the like.
- “energy ray curable” means the property of being cured by irradiation with energy rays
- “non-energy ray curable” means the property of not being cured even when irradiated with energy rays. .
- the thickness of the semiconductor wafer or semiconductor chip that is the target of use of the composite sheet for forming a protective film of the present invention is not particularly limited, but is preferably 30 to 1000 ⁇ m because the effects of the present invention can be obtained more remarkably. 100 to 300 ⁇ m is more preferable.
- the configuration of the present invention will be described in detail.
- the support sheet may be composed of one layer (single layer) or may be composed of two or more layers.
- the constituent materials and thicknesses of the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effects of the present invention are not impaired.
- the plurality of layers may be the same or different from each other” means “all the layers may be the same or all the layers are different. Means that only some of the layers may be the same ”, and“ a plurality of layers are different from each other ”means that“ at least one of the constituent materials and thickness of each layer is different from each other ”. Means.
- Preferred support sheets include, for example, those in which the pressure-sensitive adhesive layer is directly contacted and laminated on the substrate, those in which the pressure-sensitive adhesive layer is laminated on the substrate via an intermediate layer, and only the substrate. And the like.
- a support sheet consisting only of a substrate is preferred.
- FIG. 1 is a cross-sectional view schematically showing an embodiment of the composite sheet for forming a protective film of the present invention.
- the protective film-forming composite sheet 1 ⁇ / b> C shown here does not include an adhesive layer. That is, in the protective film-forming composite sheet 1 ⁇ / b> C, the support sheet 10 is made of only the base material 11. Then, the protective film forming film 13 is laminated on one surface 11a of the substrate 11 (one surface 10a of the support sheet 10), and a part of the surface 13a of the protective film forming film 13, that is, in the vicinity of the peripheral portion.
- the jig adhesive layer 16 is laminated in the region, and the surface 13 a of the protective film forming film 13 on which the jig adhesive layer 16 is not laminated and the surface 16 a of the jig adhesive layer 16.
- a release film 15 is laminated on the upper surface and the side surface.
- the adhesive force between the protective film-forming film 13 after curing (ie, the protective film) and the support sheet 10 is: It is preferably 50 to 1500 mN / 25 mm.
- the protective film-forming composite sheet 1C shown in FIG. 1 has a semiconductor wafer (not shown) attached to the front surface 13a of the protective film-forming film 13 with the release film 15 removed.
- the upper surface of the surface 16a of the adhesive layer 16 is used by being attached to a jig such as a ring frame.
- FIG. 2 is a cross-sectional view schematically showing another embodiment of the composite sheet for forming a protective film of the present invention.
- the protective sheet-forming composite sheet 1D shown here is the same as the protective film-forming composite sheet 1C shown in FIG. 1 except that the jig adhesive layer 16 is not provided. That is, in the protective sheet-forming composite sheet 1D, the protective film-forming film 13 is laminated on one surface 11a of the substrate 11, and the release film 15 is laminated on the entire surface 13a of the protective film-forming film 13. Yes.
- the composite sheet 1D for forming a protective film shown in FIG. 2 is a state in which a semiconductor wafer (not shown) is formed in a partial region on the center side of the surface 13a of the protective film-forming film 13 with the release film 15 removed.
- the back surface is affixed, and the region near the periphery of the protective film-forming film 13 is affixed to a jig such as a ring frame and used.
- the composite sheet for forming a protective film of the present invention may include a jig adhesive layer.
- the composite sheet for forming a protective film of the present invention having a jig adhesive layer is usually provided with a jig adhesive layer on the protective film forming film. Is preferred.
- the composite sheet for forming a protective film of the present invention is not limited to the one shown in FIGS. 1 to 3, and a part of the structure shown in FIGS. 1 to 3 is changed or deleted within a range not impairing the effects of the present invention.
- another configuration may be added to what has been described so far.
- a gap may be partially formed between the release film and the layer that is in direct contact with the release film.
- the size and shape of each layer can be arbitrarily adjusted according to the purpose.
- the support sheet may be transparent, opaque, or colored depending on the purpose. Among them, in the present invention in which the protective film-forming film has energy ray curability, the support sheet is preferably capable of transmitting energy rays.
- the transmittance of light having a wavelength of 375 nm is preferably 30% or more, more preferably 50% or more, and particularly preferably 70% or more.
- the degree of curing of the protective film-forming film is further improved.
- the upper limit value of the transmittance of light having a wavelength of 375 nm is not particularly limited, but may be 95%, for example.
- the transmittance of light having a wavelength of 532 nm is preferably 30% or more, more preferably 50% or more, and particularly preferably 70% or more.
- the upper limit value of the transmittance of light having a wavelength of 532 nm is not particularly limited, but can be, for example, 95%.
- the transmittance of light having a wavelength of 1064 nm is preferably 30% or more, more preferably 50% or more, and particularly preferably 70% or more.
- the upper limit value of the transmittance of light having a wavelength of 1064 nm is not particularly limited, but can be, for example, 95%.
- the base material is in the form of a sheet or film, and examples of the constituent material include various resins.
- the resin include polyethylenes such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE); other than polyethylene such as polypropylene, polybutene, polybutadiene, polymethylpentene, and norbornene resin.
- Polyolefins such as ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer, ethylene-norbornene copolymer (ethylene as a monomer)
- a copolymer obtained by using a vinyl chloride resin such as polyvinyl chloride and vinyl chloride copolymer (a resin obtained by using vinyl chloride as a monomer); polystyrene; polycycloolefin; polyethylene terephthalate, polyethylene Naphtha Polyesters such as polyesters, polybutylene terephthalates, polyethylene isophthalates, polyethylene-2,6-naphthalene dicarboxylates, wholly aromatic polyesters in which all the structural units have an aromatic cyclic group; Poly (meth) acrylic acid ester; Polyurethane; Polyurethane acrylate; Polyimide; Polyamide; Polycarbonate; Fluororesin
- the polymer alloy of the polyester and the other resin is preferably one in which the amount of the resin other than the polyester is relatively small.
- the resin include a crosslinked resin in which one or more of the resins exemplified so far are crosslinked; modification of an ionomer or the like using one or more of the resins exemplified so far. Resins can also be mentioned.
- (meth) acrylic acid is a concept including both “acrylic acid” and “methacrylic acid”. The same applies to terms similar to (meth) acrylic acid.
- the resin constituting the substrate may be only one kind, or two or more kinds, and in the case of two or more kinds, the combination and ratio thereof can be arbitrarily selected.
- the substrate may be composed of one layer (single layer) or may be composed of two or more layers. When the substrate is composed of a plurality of layers, these layers may be the same or different from each other.
- the combination of layers is not particularly limited.
- the thickness of the substrate is preferably 50 to 300 ⁇ m, more preferably 60 to 100 ⁇ m.
- the thickness of the substrate means the thickness of the entire substrate.
- the thickness of the substrate composed of a plurality of layers means the total thickness of all the layers constituting the substrate. means.
- the “thickness” is a value represented by an average of five arbitrary points of an object measured with a contact-type thickness meter.
- the base material is preferably one having high thickness accuracy, that is, one in which variation in thickness is suppressed regardless of the part.
- materials that can be used to construct such a substrate with high thickness accuracy include polyethylene, polyolefins other than polyethylene, polyethylene terephthalate, ethylene-vinyl acetate copolymer, and the like. Is mentioned.
- the base material contains various known additives such as a filler, a colorant, an antistatic agent, an antioxidant, an organic lubricant, a catalyst, and a softener (plasticizer) in addition to the main constituent material such as the resin. May be.
- the substrate may be transparent or opaque, may be colored according to the purpose, or other layers may be deposited.
- the film for protective film formation has energy-beam sclerosis
- the substrate is subjected to a roughening treatment such as sandblast treatment, solvent treatment, corona discharge treatment, electron beam irradiation treatment, plasma treatment.
- the surface may be subjected to oxidation treatment such as ozone / ultraviolet irradiation treatment, flame treatment, chromic acid treatment, and hot air treatment.
- the base material may have a surface subjected to primer treatment.
- the base material prevents the base material from adhering to other sheets or the base material from adhering to the adsorption table when the antistatic coating layer and the protective film-forming composite sheet are stored in an overlapping manner. It may have a layer or the like.
- the substrate preferably has a surface subjected to electron beam irradiation treatment from the viewpoint that generation of fragments of the substrate due to blade friction during dicing is suppressed.
- the surface roughness (Ra) of the surface of the substrate is the surface roughness (Ra) of at least one surface ( ⁇ ) of the protective film when the protective film-forming film is irradiated with energy rays to form a protective film. ) Is not particularly limited as long as it is 0.038 ⁇ m or more.
- the surface roughness (Ra) of at least one surface of the substrate is preferably 0.03 to 2.0 ⁇ m, and more preferably 0.05 to 1.8 ⁇ m.
- the surface roughness of at least one surface ( ⁇ ) of the protective film when the protective film is irradiated with energy rays to form a protective film by bonding the surfaces (that is, the surface ( ⁇ )) (Ra) can be adjusted to 0.038 ⁇ m or more and 1.5 ⁇ m or less.
- the surface roughness (Ra) of at least one surface of the substrate is preferably 0.05 to 1.3 ⁇ m.
- the surface roughness of at least one surface ( ⁇ ) of the protective film when the protective film is irradiated with energy rays to form a protective film by bonding the surfaces (that is, the surface ( ⁇ )) (Ra) can be adjusted to 0.038 ⁇ m or more and 0.9 ⁇ m or less.
- the surface roughness (Ra) of at least one surface of the substrate is less than 0.12 ⁇ m, more preferably less than 0.03 ⁇ m, still more preferably 0.020 to 0.025 ⁇ m. Also good.
- the surface of the substrate having such a surface roughness (Ra) has the surface roughness of the first release film in which the surface roughness (Ra) of at least one surface is 0.03 to 2.0 ⁇ m.
- a composition for forming a protective film which will be described later, is applied on the surface, dried as necessary to form a film for forming a protective film, and a second release film is bonded to the exposed surface of the film for forming a protective film.
- a protective film is formed by irradiating the protective film-forming film with energy rays by bonding the exposed surface (that is, the surface ( ⁇ )) of the protective film-forming film from which the first release film has been peeled off
- the surface roughness (Ra) of at least one surface ( ⁇ ) of the protective film can be adjusted to 0.038 ⁇ m or more and 0.9 ⁇ m or less.
- the surface roughness (Ra) of at least one surface of the substrate is less than 0.12 ⁇ m, more preferably less than 0.03 ⁇ m, still more preferably 0.020 to 0.025 ⁇ m. Also good.
- a protective film-forming composition described later is applied onto the second release film, and dried as necessary to form a protective film-forming film. And bonding the surface having the surface roughness of the first release film having a surface roughness (Ra) of at least one surface of 0.03 to 2.0 ⁇ m to the exposed surface of the protective film-forming film.
- the surface roughness (Ra) of at least one surface ( ⁇ ) of the protective film can be adjusted to 0.038 ⁇ m or more and 0.9 ⁇ m or less.
- the surface roughness (Ra) of the surface of the substrate can be measured by the measurement method described in the examples.
- the base material can be manufactured by a known method.
- a base material containing a resin can be produced by molding a resin composition containing the resin.
- the surface of at least one surface ( ⁇ ) of the protective film when the protective film-forming film is irradiated with energy rays to form a protective film, the surface of at least one surface ( ⁇ ) of the protective film
- the roughness (Ra) is 0.038 ⁇ m or more
- the adhesive force is equal to or less than the upper limit value, cracking and chipping of the semiconductor chip are suppressed when the semiconductor chip with a protective film is picked up.
- the adhesive force between the protective film obtained by curing the protective film-forming film and the support sheet is preferably 50 to 1500 mN / 25 mm, 52 to 1450 mN / 25 mm, and more preferably 53 to 1430 mN. / 25 mm is more preferable.
- the composite sheet for forming a protective film has better pickup suitability.
- the laminated structure of the cured product of the support sheet and the protective film-forming film (in other words, the support sheet and the protective film) is maintained.
- this laminate structure is referred to as a “composite sheet for forming a protective film”.
- the adhesive force between the protective film and the support sheet can be measured by the following method. That is, a protective film-forming composite sheet having a width of 25 mm and an arbitrary length is attached to an adherend by the protective film-forming film. Next, after irradiating energy rays to cure the protective film-forming film to form a protective film, the support sheet is peeled off at a peeling speed of 300 mm / min from this protective film applied to the adherend. At this time, the support sheet is peeled in the length direction (the length direction of the composite sheet for forming the protective film) so that the surfaces of the protective film and the support sheet that are in contact with each other form an angle of 180 °. The so-called 180 ° peeling is performed. And the load (peeling force) at the time of this 180 degree
- the length of the composite sheet for forming a protective film used for the measurement is not particularly limited as long as the adhesive force can be stably detected, but is preferably 100 to 300 mm. In the measurement, it is preferable that the protective sheet-forming composite sheet is stuck on the adherend and the sticking state of the protective film-forming composite sheet is stabilized.
- the adhesive force between the protective film-forming film and the support sheet is not particularly limited, and may be, for example, 80 mN / 25 mm or more, preferably 100 mN / 25 mm or more, It is more preferably 150 mN / 25 mm or more, and particularly preferably 200 mN / 25 mm or more.
- peeling between the protective film-forming film and the support sheet is suppressed during dicing. For example, from a support sheet for a semiconductor chip having a protective film-forming film on the back surface Is prevented from scattering.
- the upper limit value of the adhesive force between the protective film-forming film and the support sheet is not particularly limited, and can be any of, for example, 4000 mN / 25 mm, 3500 mN / 25 mm, 3000 mN / 25 mm, and the like. However, these are examples.
- the adhesive force between the protective film-forming film and the support sheet is between the protective film and the support sheet, except that the protective film-forming film used for measurement is not cured by irradiation with energy rays. It can be measured by the same method as adhesive strength.
- the above-mentioned adhesive force between the protective film and the support sheet and the adhesive force between the protective film-forming film and the support sheet are, for example, the types and amounts of the components contained in the protective film-forming film, It can adjust suitably by adjusting the constituent material of the layer which provides the film for protective film formation, the surface state of this layer, etc.
- the type and amount of the component contained in the protective film-forming film can be adjusted by the type and amount of the component contained in the protective film-forming composition described below. And among the components of the composition for forming a protective film, for example, the type and content of the polymer (b) having no energy ray curable group, the content of the filler (d), or the crosslinking agent (f) By adjusting the content of, the adhesive force between the protective film or the protective film-forming film and the support sheet can be adjusted more easily.
- the adhesive force between the protective film or the protective film-forming film and the support sheet is not limited to the constituent material of the base material. Even the surface condition can be adjusted.
- the surface state of the base material is, for example, the surface treatment mentioned above as improving the adhesion with the other layers of the base material, that is, the concavo-convex treatment by sandblasting, solvent treatment, etc .; corona discharge treatment, It can be adjusted by performing any one of an electron beam irradiation treatment, a plasma treatment, an ozone / ultraviolet ray irradiation treatment, a flame treatment, a chromic acid treatment, a hot air treatment and the like; and a primer treatment.
- the protective film-forming film has energy beam curability, and examples thereof include those containing an energy beam curative component (a).
- the energy ray curable component (a) is preferably uncured, preferably tacky, and more preferably uncured and tacky.
- the protective film-forming film may be only one layer (single layer), or may be two or more layers. In the case of a plurality of layers, these layers may be the same or different from each other. The combination is not particularly limited.
- the thickness of the protective film-forming film is preferably 1 to 100 ⁇ m, more preferably 5 to 75 ⁇ m, and particularly preferably 5 to 50 ⁇ m.
- the thickness of the protective film-forming film is equal to or more than the lower limit value, a protective film having higher protective ability can be formed.
- the thickness of the protective film-forming film is equal to or less than the upper limit, an excessive thickness is suppressed.
- the “thickness of the protective film-forming film” means the thickness of the entire protective film-forming film.
- the thickness of the protective film-forming film composed of a plurality of layers means the protective film-forming film. Means the total thickness of all the layers that make up.
- the curing conditions for forming the protective film by curing the protective film-forming film are not particularly limited as long as the protective film has a degree of curing that sufficiently exhibits its function, and the type of the protective film-forming film is not limited. Accordingly, it may be appropriately selected.
- the illuminance of the energy rays when the protective film-forming film is cured is preferably 4 to 280 mW / cm 2 .
- the amount of energy rays during the curing is preferably 3 to 1000 mJ / cm 2 .
- the protective film-forming film can be formed using a protective film-forming composition containing the constituent materials.
- the protective film-forming film can be formed at the target site by applying the protective film-forming composition to the surface on which the protective film-forming film is to be formed and drying it as necessary.
- the content ratio of components that do not vaporize at room temperature is usually the same as the content ratio of the components of the film for forming a protective film.
- “normal temperature” means a temperature that is not particularly cooled or heated, that is, a normal temperature, and examples thereof include a temperature of 15 to 25 ° C.
- Coating of the composition for forming a protective film may be performed by a known method, for example, air knife coater, blade coater, bar coater, gravure coater, roll coater, roll knife coater, curtain coater, die coater, knife coater, Examples include a method using various coaters such as a screen coater, a Meyer bar coater, and a kiss coater.
- the drying conditions of the protective film-forming composition are not particularly limited, but the protective film-forming composition is preferably heat-dried when it contains a solvent described later. In this case, for example, 70 to 130 ° C. It is preferable to dry under conditions of 10 seconds to 5 minutes.
- composition for forming protective film (IV-1) examples include a protective film forming composition (IV-1) containing the energy ray curable component (a).
- the energy ray-curable component (a) is a component that is cured by irradiation with energy rays, and is also a component for imparting film-forming property, flexibility, and the like to the protective film-forming film.
- Examples of the energy ray-curable component (a) include a polymer (a1) having an energy ray-curable group and a weight average molecular weight of 80000 to 2000000, and an energy ray-curable group and a molecular weight of 100 to 80000.
- a compound (a2) is mentioned.
- the polymer (a1) may be at least partially crosslinked by a crosslinking agent (f) described later, or may not be crosslinked.
- the weight average molecular weight means a polystyrene equivalent value measured by a gel permeation chromatography (GPC) method unless otherwise specified.
- Polymer (a1) having an energy ray curable group and having a weight average molecular weight of 80,000 to 2,000,000 examples include an acrylic polymer (a11) having a functional group capable of reacting with a group of another compound, An acrylic resin (a1-1) obtained by polymerizing a group that reacts with a functional group and an energy ray curable compound (a12) having an energy ray curable group such as an energy ray curable double bond.
- Examples of the functional group capable of reacting with a group possessed by another compound include a hydroxyl group, a carboxy group, an amino group, and a substituted amino group (one or two hydrogen atoms of the amino group are substituted with a group other than a hydrogen atom). Group), an epoxy group, and the like.
- the functional group is preferably a group other than a carboxy group from the viewpoint of preventing corrosion of a circuit such as a semiconductor wafer or a semiconductor chip.
- the functional group is preferably a hydroxyl group.
- the acrylic polymer (a11) having the functional group examples include those obtained by copolymerizing an acrylic monomer having the functional group and an acrylic monomer having no functional group. In addition to monomers, monomers other than acrylic monomers (non-acrylic monomers) may be copolymerized.
- the acrylic polymer (a11) may be a random copolymer or a block copolymer.
- acrylic monomer having a functional group examples include a hydroxyl group-containing monomer, a carboxy group-containing monomer, an amino group-containing monomer, a substituted amino group-containing monomer, and an epoxy group-containing monomer.
- hydroxyl group-containing monomer examples include hydroxymethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, (meth) Hydroxyalkyl (meth) acrylates such as 2-hydroxybutyl acrylate, 3-hydroxybutyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate; non- (meth) acrylic non-methacrylates such as vinyl alcohol and allyl alcohol Saturated alcohol (unsaturated alcohol which does not have a (meth) acryloyl skeleton) etc. are mentioned.
- Examples of the carboxy group-containing monomer include ethylenically unsaturated monocarboxylic acids (monocarboxylic acids having an ethylenically unsaturated bond) such as (meth) acrylic acid and crotonic acid; fumaric acid, itaconic acid, maleic acid, citracone Ethylenically unsaturated dicarboxylic acids such as acids (dicarboxylic acids having an ethylenically unsaturated bond); anhydrides of the ethylenically unsaturated dicarboxylic acids; carboxyalkyl esters of (meth) acrylic acid such as 2-carboxyethyl methacrylate, etc. It is done.
- monocarboxylic acids having an ethylenically unsaturated bond such as (meth) acrylic acid and crotonic acid
- fumaric acid, itaconic acid maleic acid, citracone
- Ethylenically unsaturated dicarboxylic acids such as acids (dica
- the acrylic monomer having a functional group is preferably a hydroxyl group-containing monomer or a carboxy group-containing monomer, more preferably a hydroxyl group-containing monomer.
- the acrylic monomer having the functional group that constitutes the acrylic polymer (a11) may be only one type, or two or more types, and when there are two or more types, the combination and ratio thereof are arbitrary. You can choose.
- acrylic monomer having no functional group examples include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and (meth) acrylate n.
- acrylic monomer having no functional group examples include alkoxy such as methoxymethyl (meth) acrylate, methoxyethyl (meth) acrylate, ethoxymethyl (meth) acrylate, and ethoxyethyl (meth) acrylate.
- the acrylic monomer which does not have the functional group constituting the acrylic polymer (a11) may be only one type, or two or more types, and when there are two or more types, the combination and ratio thereof are arbitrary. Can be selected.
- non-acrylic monomer examples include olefins such as ethylene and norbornene; vinyl acetate; styrene.
- the said non-acrylic monomer which comprises the said acrylic polymer (a11) may be only 1 type, may be 2 or more types, and when it is 2 or more types, those combinations and ratios can be selected arbitrarily.
- the ratio (content) of the amount of the structural unit derived from the acrylic monomer having the functional group to the total mass of the structural unit constituting the acrylic polymer (a11) is 0.1 to 50.
- the mass is preferably 1% by mass, more preferably 1 to 40% by mass, and particularly preferably 3 to 30% by mass.
- the acrylic resin (a1-1) obtained by copolymerization of the acrylic polymer (a11) and the energy ray-curable compound (a12) The content of the linear curable group can easily adjust the degree of curing of the first protective film within a preferable range.
- the acrylic polymer (a11) constituting the acrylic resin (a1-1) may be only one type, or two or more types, and when there are two or more types, the combination and ratio thereof are arbitrary. You can choose.
- the content of the acrylic resin (a1-1) is 1 to 40% by mass with respect to the total mass of the protective film-forming composition (IV-1). It is preferably 2 to 30% by mass, more preferably 3 to 20% by mass.
- the energy ray curable compound (a12) is one or two selected from the group consisting of an isocyanate group, an epoxy group and a carboxy group as a group capable of reacting with the functional group of the acrylic polymer (a11). Those having the above are preferred, and those having an isocyanate group as the group are more preferred. For example, when the energy beam curable compound (a12) has an isocyanate group as the group, the isocyanate group easily reacts with the hydroxyl group of the acrylic polymer (a11) having a hydroxyl group as the functional group.
- the energy ray curable compound (a12) preferably has 1 to 5 energy ray curable groups in one molecule, and more preferably 1 to 3 energy ray curable groups.
- Examples of the energy ray-curable compound (a12) include 2-methacryloyloxyethyl isocyanate, meta-isopropenyl- ⁇ , ⁇ -dimethylbenzyl isocyanate, methacryloyl isocyanate, allyl isocyanate, 1,1- (bisacryloyloxymethyl).
- Ethyl isocyanate An acryloyl monoisocyanate compound obtained by reacting a diisocyanate compound or polyisocyanate compound with hydroxyethyl (meth) acrylate; Examples thereof include an acryloyl monoisocyanate compound obtained by a reaction of a diisocyanate compound or polyisocyanate compound, a polyol compound, and hydroxyethyl (meth) acrylate.
- the energy beam curable compound (a12) is preferably 2-methacryloyloxyethyl isocyanate.
- the energy ray-curable compound (a12) constituting the acrylic resin (a1-1) may be only one type, or two or more types, and when there are two or more types, the combination and ratio thereof are arbitrary. Can be selected.
- the content of the energy beam curable group derived from the energy beam curable compound (a12) with respect to the content of the functional group derived from the acrylic polymer (a11). is preferably 20 to 120 mol%, more preferably 35 to 100 mol%, and particularly preferably 50 to 100 mol%. When the ratio of the content is within such a range, the adhesive force of the protective film formed by curing is further increased.
- the upper limit of the content ratio is 100 mol%
- the energy ray curable compound (a12) is a polyfunctional compound (having two or more of the groups in one molecule)
- the upper limit of the content ratio may exceed 100 mol%.
- the weight average molecular weight (Mw) of the polymer (a1) is preferably 100,000 to 2,000,000, and more preferably 300,000 to 1500,000.
- the polymer (a1) is at least partly crosslinked by the crosslinking agent (f)
- the polymer (a1) is described as constituting the acrylic polymer (a11).
- a monomer that does not correspond to any of the above-described monomers and has a group that reacts with the crosslinking agent (f) is polymerized to be crosslinked at the group that reacts with the crosslinking agent (f).
- the group which reacts with the said functional group derived from the said energy-beam curable compound (a12) what was bridge
- the polymer (a1) contained in the protective film-forming composition (IV-1) and the protective film-forming film may be only one type, two or more types, and when there are two or more types, Combinations and ratios can be arbitrarily selected.
- Compound (a2) having an energy ray curable group and a molecular weight of 100 to 80,000 examples include a group containing an energy ray curable double bond. Preferred examples include (meth) An acryloyl group, a vinyl group, etc. are mentioned.
- the compound (a2) is not particularly limited as long as it satisfies the above conditions, but has a low molecular weight compound having an energy ray curable group, an epoxy resin having an energy ray curable group, and an energy ray curable group.
- a phenol resin etc. are mentioned.
- examples of the low molecular weight compound having an energy ray curable group include polyfunctional monomers or oligomers, and an acrylate compound having a (meth) acryloyl group is preferable.
- examples of the acrylate compound include 2-hydroxy-3- (meth) acryloyloxypropyl methacrylate, polyethylene glycol di (meth) acrylate, propoxylated ethoxylated bisphenol A di (meth) acrylate, and 2,2-bis [4 -((Meth) acryloxypolyethoxy) phenyl] propane, ethoxylated bisphenol A di (meth) acrylate, 2,2-bis [4-((meth) acryloxydiethoxy) phenyl] propane, 9,9-bis [4- (2- (meth) acryloyloxyethoxy) phenyl] fluorene, 2,2-bis [4-((meth) acryloxypolypropoxy) phenyl] propane,
- the epoxy resin having an energy ray curable group and the phenol resin having an energy ray curable group are described in, for example, paragraph 0043 of “JP 2013-194102 A”. Things can be used.
- Such a resin corresponds to a resin constituting the thermosetting component (h) described later, but is treated as the compound (a2) in the present invention.
- the compound (a2) preferably has a weight average molecular weight of 100 to 30,000, more preferably 300 to 10,000.
- the protective film-forming composition (IV-1) and the compound (a2) contained in the protective film-forming film may be only one kind, two kinds or more, and combinations of two or more kinds.
- the ratio can be arbitrarily selected.
- Polymer (b) having no energy ray curable group When the protective film forming composition (IV-1) and the protective film forming film contain the compound (a2) as the energy ray curable component (a), the polymer further does not have an energy ray curable group. It is also preferable to contain (b).
- the polymer (b) may be at least partially crosslinked by the crosslinking agent (f) or may not be crosslinked.
- polymer (b) having no energy ray curable group examples include acrylic polymers, phenoxy resins, urethane resins, polyesters, rubber resins, acrylic urethane resins, polyvinyl alcohol (PVA), butyral resins, and polyester urethanes. Examples thereof include resins.
- the polymer (b) is preferably an acrylic polymer (hereinafter sometimes abbreviated as “acrylic polymer (b-1)”).
- the acrylic polymer (b-1) may be a known one, for example, a homopolymer of one acrylic monomer or a copolymer of two or more acrylic monomers. Alternatively, it may be a copolymer of one or two or more acrylic monomers and a monomer (non-acrylic monomer) other than one or two or more acrylic monomers.
- acrylic monomer constituting the acrylic polymer (b-1) examples include (meth) acrylic acid alkyl ester, (meth) acrylic acid ester having a cyclic skeleton, glycidyl group-containing (meth) acrylic acid ester, Examples include hydroxyl group-containing (meth) acrylic acid esters and substituted amino group-containing (meth) acrylic acid esters.
- substituted amino group is as described above.
- Examples of the (meth) acrylic acid alkyl ester include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and n- (meth) acrylate.
- Examples of the (meth) acrylic acid ester having a cyclic skeleton include (meth) acrylic acid cycloalkyl esters such as isobornyl (meth) acrylate and dicyclopentanyl (meth) acrylate; (Meth) acrylic acid aralkyl esters such as (meth) acrylic acid benzyl; (Meth) acrylic acid cycloalkenyl esters such as (meth) acrylic acid dicyclopentenyl ester; Examples include (meth) acrylic acid cycloalkenyloxyalkyl esters such as (meth) acrylic acid dicyclopentenyloxyethyl ester.
- Examples of the glycidyl group-containing (meth) acrylic ester include glycidyl (meth) acrylate.
- Examples of the hydroxyl group-containing (meth) acrylic acid ester include hydroxymethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 3-hydroxy (meth) acrylate. Examples include propyl, 2-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and the like.
- Examples of the substituted amino group-containing (meth) acrylic acid ester include N-methylaminoethyl (meth) acrylate.
- non-acrylic monomer constituting the acrylic polymer (b-1) examples include olefins such as ethylene and norbornene; vinyl acetate; styrene.
- the reactive functional group in the polymer (b) is a crosslinking agent (f ).
- the reactive functional group may be appropriately selected according to the type of the crosslinking agent (f) and the like, and is not particularly limited.
- the crosslinking agent (f) is a polyisocyanate compound
- examples of the reactive functional group include a hydroxyl group, a carboxy group, and an amino group. Among these, a hydroxyl group having high reactivity with an isocyanate group. Is preferred.
- the crosslinking agent (f) is an epoxy compound
- examples of the reactive functional group include a carboxy group, an amino group, an amide group, etc. Among them, a carboxy group having high reactivity with an epoxy group. Groups are preferred.
- the reactive functional group is preferably a group other than a carboxy group in terms of preventing corrosion of a circuit of a semiconductor wafer or a semiconductor chip.
- Examples of the polymer (b) having the reactive functional group and not having the energy ray-curable group include those obtained by polymerizing at least the monomer having the reactive functional group.
- examples of the polymer (b) having a hydroxyl group as a reactive functional group include those obtained by polymerizing a hydroxyl group-containing (meth) acrylic acid ester.
- Examples of the acrylic monomer or non-acrylic monomer include those obtained by polymerizing a monomer in which one or two or more hydrogen atoms are substituted with the reactive functional group.
- the ratio (content) of the amount of the structural unit derived from the monomer having the reactive functional group with respect to the total mass of the structural unit constituting the polymer is 1 to
- the content is preferably 25% by mass, and more preferably 2 to 20% by mass.
- the degree of cross-linking becomes a more preferable range in the polymer (b).
- the weight average molecular weight (Mw) of the polymer (b) having no energy ray-curable group is 10,000 to 2,000,000 from the viewpoint that the film-forming property of the protective film-forming composition (IV-1) becomes better. It is preferably 100000 to 1500,000.
- the polymer (b) having no energy ray-curable group contained in the protective film-forming composition (IV-1) and the protective film-forming film may be only one kind or two or more kinds. In the case of more than species, their combination and ratio can be arbitrarily selected.
- Examples of the protective film-forming composition (IV-1) include those containing one or both of the polymer (a1) and the compound (a2).
- the protective film-forming composition (IV-1) contains the compound (a2), it preferably contains a polymer (b) that does not have an energy ray-curable group. It is also preferable to contain (a1). Further, the protective film-forming composition (IV-1) does not contain the compound (a2) and contains both the polymer (a1) and the polymer (b) having no energy ray-curable group. It may be.
- the protective film-forming composition (IV-1) contains the polymer (a1), the compound (a2) and the polymer (b) having no energy ray-curable group
- the protective film-forming composition In (IV-1) the content of the compound (a2) is 10 to 10 parts per 100 parts by mass of the total content of the polymer (a1) and the polymer (b) having no energy ray-curable group.
- the amount is preferably 400 parts by mass, and more preferably 30 to 350 parts by mass.
- the total content of the energy beam curable component (a) and the polymer (b) having no energy beam curable group with respect to the total content of components other than the solvent is 5 to 90% by mass.
- it is 10 to 80% by mass, more preferably 15 to 70% by mass.
- One aspect of the present invention is the ratio of the total content of the energy ray-curable component (a) and the polymer (b) having no energy ray-curable group to the total content of components other than the solvent, It is preferably 78 to 92% by mass, more preferably 82 to 91% by mass, and still more preferably 84 to 90% by mass.
- the protective film forming composition (IV-1) contains the energy beam curable component (a) and the polymer (b) having no energy beam curable group
- the protective film forming composition (IV-1) ) And the protective film-forming film the content of the polymer (b) is preferably 3 to 160 parts by mass with respect to 100 parts by mass of the energy ray-curable component (a). More preferably, it is ⁇ 130 parts by mass.
- the content of the polymer (b) is in such a range, the energy ray curability of the protective film-forming film becomes better.
- the protective film-forming composition (IV-1) comprises a photopolymerization initiator (c) depending on the purpose.
- the protective film-forming composition (IV-1) containing the energy ray-curable component (a) and the thermosetting component (h) the protective film-forming film formed is heated. Adhesive strength to the adherend is improved, and the strength of the protective film formed from this protective film-forming film is also improved.
- Photopolymerization initiator (c) examples include benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzoin benzoic acid, benzoin methyl benzoate, and benzoin dimethyl ketal; acetophenone, 2 Acetophenone compounds such as -hydroxy-2-methyl-1-phenyl-propan-1-one, 2,2-dimethoxy-1,2-diphenylethane-1-one; bis (2,4,6-trimethylbenzoyl) phenyl Acylphosphine oxide compounds such as phosphine oxide and 2,4,6-trimethylbenzoyldiphenylphosphine oxide; sulfides such as benzylphenyl sulfide and tetramethylthiuram monosulfide Compound; ⁇ -ketol compound such as 1-hydroxy
- the photopolymerization initiator (c) contained in the protective film-forming composition (IV-1) may be only one type, or two or more types, and when there are two or more types, the combination and ratio thereof are arbitrary. Can be selected.
- the content of the photopolymerization initiator (c) is 100 parts by mass of the energy ray-curable compound (a).
- the amount is preferably 0.01 to 20 parts by mass, more preferably 0.03 to 10 parts by mass, and particularly preferably 0.05 to 5 parts by mass.
- the protective film-forming film contains the filler (d)
- the protective film obtained by curing the protective film-forming film can easily adjust the thermal expansion coefficient.
- the reliability of the package obtained using the composite sheet for forming a protective film is further improved.
- the moisture absorption rate of a protective film can be reduced or heat dissipation can be improved because the film for protective film formation contains a filler (d).
- the filler (d) include those made of a heat conductive material.
- the filler (d) may be either an organic filler or an inorganic filler, but is preferably an inorganic filler.
- Preferred inorganic fillers include, for example, powders of silica, alumina, talc, calcium carbonate, titanium white, bengara, silicon carbide, boron nitride, and the like; beads formed by spheroidizing these inorganic fillers; surface modification of these inorganic fillers Products; single crystal fibers of these inorganic fillers; glass fibers and the like.
- the inorganic filler is preferably silica or alumina, and more preferably silica whose surface is modified with an epoxy group.
- the average particle size of the filler (d) is not particularly limited, but is preferably 0.01 to 20 ⁇ m, more preferably 0.1 to 15 ⁇ m, and particularly preferably 0.3 to 10 ⁇ m. .
- the filler (d) has an average particle size of 0.05 to 0.1 ⁇ m.
- “average particle size” means the value of the particle size (D 50 ) at an integrated value of 50% in the particle size distribution curve obtained by the laser diffraction scattering method, unless otherwise specified. .
- the protective film-forming composition (IV-1) and the filler (d) contained in the protective film-forming film may be only one type, two or more types, and combinations of two or more types.
- the ratio can be arbitrarily selected.
- the content of the filler (d) in the film is preferably 5 to 83% by mass, more preferably 7 to 78% by mass.
- the content of the filler (d) is in such a range, the adjustment of the thermal expansion coefficient becomes easier.
- the content of the filler (d) is preferably 4 to 15% by mass, more preferably 4 to 10% by mass with respect to the mass of the protective film-forming film. .
- the content of the filler (d) is 4 with respect to the mass of the protective film-forming film. It is preferably ⁇ 15% by mass, more preferably 4 to 10% by mass.
- Coupleling agent (e) By using a coupling agent (e) having a functional group capable of reacting with an inorganic compound or an organic compound, the adhesion and adhesion of the protective film-forming film to the adherend can be improved. Further, by using the coupling agent (e), the protective film obtained by curing the protective film-forming film has improved water resistance without impairing the heat resistance.
- the coupling agent (e) is preferably a compound having a functional group capable of reacting with the functional group of the energy beam curable component (a), the polymer (b) having no energy beam curable group, and the like. More preferably, it is a silane coupling agent.
- silane coupling agent examples include 3-glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropylmethyldiethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidyloxymethyldiethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3- (2-aminoethylamino) propyltrimethoxysilane, 3- (2-amino Ethylamino) propylmethyldiethoxysilane, 3- (phenylamino) propyltrimethoxysilane, 3-anilinopropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, 3-mercaptopropi Examples include trimethoxysilane, 3-
- the protective film-forming composition (IV-1) and the coupling agent (e) contained in the protective film-forming film may be only one type, two or more types, and when there are two or more types, Combinations and ratios can be arbitrarily selected.
- the content of the coupling agent (e) in the composition for forming a protective film (IV-1) and the film for forming a protective film includes the energy ray curable component (a) and the energy. It is preferably 0.03 to 20 parts by mass, more preferably 0.05 to 10 parts by mass with respect to 100 parts by mass of the total content of the polymer (b) having no linear curable group, The amount is particularly preferably 0.1 to 5 parts by mass.
- the content of the coupling agent (e) is equal to or higher than the lower limit, the dispersibility of the filler (d) in the resin is improved and the adhesion of the protective film-forming film to the adherend is improved. The effect by using a coupling agent (e) etc. is acquired more notably. Moreover, generation
- Crosslinking agent (f) By using the crosslinking agent (F) and crosslinking the polymer (b) having no energy beam curable component (a) or energy beam curable group, the initial adhesive force and cohesive force of the protective film-forming film. Can be adjusted.
- crosslinking agent (f) examples include organic polyvalent isocyanate compounds, organic polyvalent imine compounds, metal chelate crosslinking agents (crosslinking agents having a metal chelate structure), aziridine crosslinking agents (crosslinking agents having an aziridinyl group), and the like. Is mentioned.
- organic polyvalent isocyanate compound examples include an aromatic polyvalent isocyanate compound, an aliphatic polyvalent isocyanate compound, and an alicyclic polyvalent isocyanate compound (hereinafter, these compounds are collectively referred to as “aromatic polyvalent isocyanate compound and the like”).
- a trimer such as the aromatic polyisocyanate compound, isocyanurate and adduct; a terminal isocyanate urethane prepolymer obtained by reacting the aromatic polyvalent isocyanate compound and the polyol compound. Etc.
- the “adduct body” includes the aromatic polyvalent isocyanate compound, the aliphatic polyvalent isocyanate compound, or the alicyclic polyvalent isocyanate compound, and a low amount of ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil, or the like. It means a reaction product with a molecularly active hydrogen-containing compound, and examples thereof include an xylylene diisocyanate adduct of trimethylolpropane as described later.
- the “terminal isocyanate urethane prepolymer” means a prepolymer having a urethane bond and an isocyanate group at the end of the molecule.
- organic polyvalent isocyanate compound for example, 2,4-tolylene diisocyanate; 2,6-tolylene diisocyanate; 1,3-xylylene diisocyanate; 1,4-xylene diisocyanate; diphenylmethane-4 Dimethylmethane-2,4'-diisocyanate; 3-methyldiphenylmethane diisocyanate; hexamethylene diisocyanate; isophorone diisocyanate; dicyclohexylmethane-4,4'-diisocyanate; dicyclohexylmethane-2,4'-diisocyanate; trimethylol Any one of tolylene diisocyanate, hexamethylene diisocyanate and xylylene diisocyanate is added to all or some hydroxyl groups of a polyol such as propane. Or two or more compounds are added; lysine diisocyanate.
- a polyol such as propane.
- organic polyvalent imine compound examples include N, N′-diphenylmethane-4,4′-bis (1-aziridinecarboxamide), trimethylolpropane-tri- ⁇ -aziridinylpropionate, and tetramethylolmethane.
- -Tri- ⁇ -aziridinylpropionate, N, N′-toluene-2,4-bis (1-aziridinecarboxamide) triethylenemelamine and the like.
- the crosslinking agent (f) When an organic polyvalent isocyanate compound is used as the crosslinking agent (f), it is preferable to use a hydroxyl group-containing polymer as the energy ray curable component (a) or the polymer (b) having no energy ray curable group.
- the crosslinking agent (f) has an isocyanate group, and the energy ray-curable component (a) or the polymer (b) having no energy ray-curable group has a hydroxyl group, the crosslinking agent (f) and the energy ray-curable property.
- a cross-linked structure can be easily introduced into the protective film-forming film by reaction with the component (a) or the polymer (b) having no energy ray-curable group.
- the crosslinking agent (f) contained in the protective film-forming composition (IV-1) and the protective film-forming film may be only one type, two or more types, or a combination of two or more types.
- the ratio can be arbitrarily selected.
- the content of the crosslinking agent (f) in the protective film-forming composition (IV-1) is such that the energy ray-curable component (a) and the energy ray-curable group having no energy ray-curable group are contained.
- the total content of the combined (b) is preferably 0.01 to 20 parts by weight, more preferably 0.1 to 10 parts by weight, and 0.5 to 5 parts by weight with respect to 100 parts by weight. It is particularly preferred.
- the content of the cross-linking agent (f) is equal to or higher than the lower limit value, the effect of using the cross-linking agent (f) is more remarkably obtained.
- the excessive use of a crosslinking agent (f) is suppressed because the said content of a crosslinking agent (f) is below the said upper limit.
- Colorant (g) examples include known pigments such as inorganic pigments, organic pigments, and organic dyes.
- organic pigments and organic dyes examples include aminium dyes, cyanine dyes, merocyanine dyes, croconium dyes, squalium dyes, azurenium dyes, polymethine dyes, naphthoquinone dyes, pyrylium dyes, and phthalocyanines.
- the inorganic pigment examples include carbon black, cobalt dye, iron dye, chromium dye, titanium dye, vanadium dye, zirconium dye, molybdenum dye, ruthenium dye, platinum dye, ITO ( Indium tin oxide) dyes, ATO (antimony tin oxide) dyes, and the like.
- the protective film-forming composition (IV-1) and the colorant (g) contained in the protective film-forming film may be only one kind, two kinds or more, and combinations of two or more kinds.
- the ratio can be arbitrarily selected.
- the content of the colorant (g) in the protective film-forming film may be appropriately adjusted according to the purpose.
- the protective film may be printed by laser irradiation, and by adjusting the content of the colorant (g) in the protective film-forming film and adjusting the light transmittance of the protective film, the print visibility is improved. Can be adjusted.
- the ratio of the content of the colorant (g) to the total content of all components other than the solvent (that is, the colorant (g )) Is preferably 0.1 to 10% by mass, more preferably 0.4 to 7.5% by mass, and particularly preferably 0.8 to 5% by mass.
- the effect by using a colorant (g) is acquired more notably because the content of the colorant (g) is not less than the lower limit. Moreover, the excessive use of a coloring agent (g) is suppressed because the said content of a coloring agent (g) is below the said upper limit.
- thermosetting component (h) The thermosetting component (h) contained in the protective film-forming composition (IV-1) and the protective film-forming film may be only one kind, two kinds or more, and if two or more kinds, These combinations and ratios can be arbitrarily selected.
- thermosetting component (h) examples include epoxy thermosetting resins, thermosetting polyimides, polyurethanes, unsaturated polyesters, and silicone resins, and epoxy thermosetting resins are preferable.
- the epoxy thermosetting resin includes an epoxy resin (h1) and a thermosetting agent (h2).
- the epoxy thermosetting resin contained in the protective film-forming composition (IV-1) and the protective film-forming film may be only one type, two or more types, and when there are two or more types, Combinations and ratios can be arbitrarily selected.
- Epoxy resin (h1) examples include known ones such as polyfunctional epoxy resins, biphenyl compounds, bisphenol A diglycidyl ether and hydrogenated products thereof, orthocresol novolac epoxy resins, dicyclopentadiene type epoxy resins, Biphenyl type epoxy resins, bisphenol A type epoxy resins, bisphenol F type epoxy resins, phenylene skeleton type epoxy resins, and the like, and bifunctional or higher functional epoxy compounds are listed.
- an epoxy resin having an unsaturated hydrocarbon group may be used as the epoxy resin (h1).
- An epoxy resin having an unsaturated hydrocarbon group is more compatible with an acrylic resin than an epoxy resin having no unsaturated hydrocarbon group. Therefore, the reliability of the package obtained using the composite sheet for forming a protective film is improved by using an epoxy resin having an unsaturated hydrocarbon group.
- Examples of the epoxy resin having an unsaturated hydrocarbon group include compounds obtained by converting a part of the epoxy group of a polyfunctional epoxy resin into a group having an unsaturated hydrocarbon group. Such a compound can be obtained, for example, by addition reaction of (meth) acrylic acid or a derivative thereof to an epoxy group. Moreover, as an epoxy resin which has an unsaturated hydrocarbon group, the compound etc. which the group which has an unsaturated hydrocarbon group directly couple
- the unsaturated hydrocarbon group is a polymerizable unsaturated group, and specific examples thereof include an ethenyl group (also referred to as a vinyl group), a 2-propenyl group (also referred to as an allyl group), and a (meth) acryloyl group. , (Meth) acrylamide groups and the like, and an acryloyl group is preferred.
- the number average molecular weight of the epoxy resin (h1) is not particularly limited, but is preferably 300 to 30000 from the viewpoint of curability of the protective film-forming film and strength and heat resistance of the protective film, and is preferably 400 to 10,000. More preferably, it is more preferably 500 to 3000.
- the “number average molecular weight” means a number average molecular weight represented by a standard polystyrene equivalent value measured by a gel permeation chromatography (GPC) method unless otherwise specified.
- the epoxy equivalent of the epoxy resin (h1) is preferably 100 to 1000 g / eq, and more preferably 150 to 800 g / eq.
- the “epoxy equivalent” means the number of grams (g / eq) of an epoxy compound containing 1 gram equivalent of an epoxy group, and can be measured according to the method of JIS K 7236: 2001.
- epoxy resin (h1) one type may be used alone, or two or more types may be used in combination, and when two or more types are used in combination, their combination and ratio can be arbitrarily selected.
- thermosetting agent (h2) functions as a curing agent for the epoxy resin (h1).
- a thermosetting agent (h2) the compound which has 2 or more of functional groups which can react with an epoxy group in 1 molecule is mentioned, for example.
- the functional group include a phenolic hydroxyl group, an alcoholic hydroxyl group, an amino group, a carboxy group, a group in which an acid group has been anhydrideized, and the like, and a phenolic hydroxyl group, an amino group, or an acid group has been anhydrideized. It is preferably a group, more preferably a phenolic hydroxyl group or an amino group.
- thermosetting agents (h2) examples of the phenol-based curing agent having a phenolic hydroxyl group include polyfunctional phenol resins, biphenols, novolac-type phenol resins, dicyclopentadiene-based phenol resins, and aralkyl phenol resins.
- examples of the amine-based curing agent having an amino group include dicyandiamide (hereinafter sometimes abbreviated as “DICY”).
- the thermosetting agent (h2) may have an unsaturated hydrocarbon group.
- the thermosetting agent (h2) having an unsaturated hydrocarbon group for example, a compound in which a part of the hydroxyl group of the phenol resin is substituted with a group having an unsaturated hydrocarbon group, an aromatic ring of the phenol resin, Examples thereof include compounds in which a group having a saturated hydrocarbon group is directly bonded.
- the unsaturated hydrocarbon group in the thermosetting agent (h2) is the same as the unsaturated hydrocarbon group in the epoxy resin having an unsaturated hydrocarbon group described above.
- thermosetting agent (h2) In the case where a phenolic curing agent is used as the thermosetting agent (h2), it is preferable that the thermosetting agent (h2) has a high softening point or glass transition temperature from the viewpoint of improving the peelability of the protective film from the support sheet.
- the “glass transition temperature” is represented by the temperature of the inflection point of the DSC curve obtained by measuring the DSC curve of the sample using a differential scanning calorimeter.
- thermosetting agent (h2) for example, the number average molecular weight of the resin component such as polyfunctional phenolic resin, novolac-type phenolic resin, dicyclopentadiene-based phenolic resin, aralkylphenolic resin, etc. is preferably 300 to 30000, It is more preferably 400 to 10,000, and particularly preferably 500 to 3000.
- the molecular weight of non-resin components such as biphenol and dicyandiamide is not particularly limited, but is preferably 60 to 500, for example.
- thermosetting agent (h2) may be used individually by 1 type, may use 2 or more types together, and when using 2 or more types together, those combinations and ratios can be selected arbitrarily.
- the content of the thermosetting agent (h2) is 100% of the epoxy resin (h1).
- the amount is preferably 0.01 to 20 parts by mass with respect to parts by mass.
- thermosetting component (h) when used, the content of the thermosetting component (h) (for example, the epoxy resin (h1) and the heat in the protective film-forming composition (IV-1) and the protective film-forming film)
- the total content of the curing agent (h2) is preferably 1 to 500 parts by mass with respect to 100 parts by mass of the polymer (b) having no energy ray curable group.
- the general-purpose additive (z) may be a known one, and can be arbitrarily selected according to the purpose, and is not particularly limited. Preferred examples include a plasticizer, an antistatic agent, an antioxidant, and a gettering agent. Is mentioned.
- the general-purpose additive (z) contained in the protective film-forming composition (IV-1) and the protective film-forming film may be only one kind, two or more kinds, and when there are two or more kinds, Combinations and ratios can be arbitrarily selected.
- the content of the general-purpose additive (z) in the protective film-forming composition (IV-1) and the protective film-forming film is not particularly limited and is appropriately selected according to the purpose. do it.
- the protective film-forming composition (IV-1) preferably further contains a solvent.
- the protective film-forming composition (IV-1) containing a solvent has good handleability.
- the solvent is not particularly limited, but preferred examples include hydrocarbons such as toluene and xylene; methanol, ethanol, 2-propanol, isobutyl alcohol (also referred to as 2-methylpropan-1-ol), 1-butanol and the like. And alcohols; esters such as ethyl acetate; ketones such as acetone and methyl ethyl ketone; ethers such as tetrahydrofuran; amides (compounds having an amide bond) such as dimethylformamide and N-methylpyrrolidone.
- the solvent contained in the protective film-forming composition (IV-1) may be only one type, or two or more types, and in the case of two or more types, the combination and ratio thereof can be arbitrarily selected.
- the solvent contained in the protective film-forming composition (IV-1) is methyl ethyl ketone, toluene, ethyl acetate, or the like from the viewpoint that the components contained in the protective film-forming composition (IV-1) can be mixed more uniformly. It is preferable.
- the protective film-forming composition (IV-1) has tricyclodecane dimethylol diacrylate (content: protective film-forming composition (IV) as the energy ray-curable component (a2).
- the composition for forming a protective film such as the composition for forming a protective film (IV-1) can be obtained by blending each component for constituting the composition.
- the order of addition at the time of blending each component is not particularly limited, and two or more components may be added simultaneously.
- a solvent it may be used by mixing the solvent with any compounding component other than the solvent and diluting the compounding component in advance, or by diluting any compounding component other than the solvent in advance. You may use it by mixing a solvent with these compounding ingredients, without leaving.
- the method of mixing each component at the time of compounding is not particularly limited, from a known method such as a method of mixing by rotating a stirrer or a stirring blade; a method of mixing using a mixer; a method of mixing by applying ultrasonic waves What is necessary is just to select suitably.
- the temperature and time during the addition and mixing of each component are not particularly limited as long as each compounding component does not deteriorate, and may be adjusted as appropriate, but the temperature is preferably 15 to 30 ° C.
- the protective film-forming composite sheet of the present invention is affixed to the back surface opposite to the circuit surface of the semiconductor wafer or semiconductor chip, and as a composite sheet provided with a layer showing adhesion on the support sheet.
- a dicing die bonding sheet There is a dicing die bonding sheet.
- the adhesive layer provided in the dicing die bonding sheet functions as an adhesive when the semiconductor chip is picked up from the support sheet together with the semiconductor chip and then attached to the substrate, the lead frame, or another semiconductor chip.
- the protective film-forming film in the protective film-forming composite sheet of the present invention is the same as the adhesive layer in that it is picked up from the support sheet together with the semiconductor chip, but eventually becomes a protective film by curing, It has a function of protecting the back surface of the semiconductor chip that is affixed.
- the protective film-forming film in the present invention has a different use from the adhesive layer in the dicing die bonding sheet, and naturally the required performance is also different. Reflecting this difference in use, the protective film-forming film is usually harder and more difficult to pick up than the adhesive layer in the dicing die bonding sheet.
- the composite sheet for forming a protective film according to the present invention is extremely excellent as compared with the conventional one with regard to the suitability for picking up a semiconductor chip with a protective film, provided with an energy ray curable protective film-forming film.
- the protective film-forming composition is applied onto a release film (sometimes referred to as a second release film), and dried as necessary.
- a protective film-forming film is formed, and the surface roughness (Ra) of at least one surface is 0.03 to 2.0 ⁇ m on the exposed surface (that is, the surface ( ⁇ )) of the protective film-forming film. It can manufacture by bonding the surface which has the said surface roughness of a 1st peeling film.
- the surface roughness (Ra) of the surface of the first release film is preferably 0.03 to 1.8 ⁇ m.
- a protective film-forming film provided with a release film may be referred to as a “protective film-forming sheet”.
- the second aspect of the method for producing a protective film-forming film of the present invention is a release film in which the surface roughness (Ra) of at least one surface is 0.03 to 2.0 ⁇ m (when referred to as a first release film)
- the composition for forming a protective film can be coated on the surface having the surface roughness, and dried as necessary.
- the surface roughness (Ra) of the surface of the first release film is preferably 0.03 to 1.8 ⁇ m.
- the protective film-forming film of the present invention is a protective film-forming film produced as described above, on the surface opposite to the surface to which the first release film is attached (that is, the surface ( ⁇ )).
- Another release film (sometimes referred to as a second release film) may be attached.
- a protective film-forming film provided with a release film may be referred to as a “protective film-forming sheet”.
- the protective film-forming film is a solid content of tricyclodecane dimethylol diacrylate (content: protective film-forming composition (IV-1)) as the energy ray-curable component (a2). 37 to 45% by mass, more preferably 40 to 43% by mass) based on the total mass of the polymer; the polymer (b) as a structural unit derived from butyl acrylate (8 to 12% with respect to the mass of the acrylic resin).
- Mass% more preferably 10 mass%), a structural unit derived from methyl acrylate (68 to 72 mass%, more preferably 70 mass% based on the mass of the acrylic resin), a structural unit derived from glycidyl methacrylate ( 3 to 7% by mass, more preferably 5% by mass based on the mass of the acrylic resin) and a structural unit derived from 2-hydroxyethyl acrylate (based on the mass of the acrylic resin) 3 to 17% by mass, more preferably 15% by mass) of acrylic resin (content: 41 to 50% by mass, more preferably based on the total mass of the solid content of the protective film-forming composition (IV-1)) 44-47% by mass); 2- (dimethylamino) -1- (4-morpholinophenyl) -2-benzyl-1-butanone (content: composition for forming a protective film) as a photopolymerization initiator (c) 0.2 to 1.1% by mass, more preferably 0.6 to 0.64% by mass with respect to the total mass of the
- composition for forming a protective film on a surface having a surface roughness of a release film (sometimes referred to as a first release film) having a surface roughness (Ra) of at least one surface of 0.03 to 2.0 ⁇ m An object is applied and dried as necessary to form a protective film-forming film, and a second release film is bonded to the exposed surface of the protective film-forming film.
- the surface roughness (Ra) of the surface of the substrate is not particularly limited, but the surface roughness (Ra) is, for example, less than 0.12 ⁇ m, more preferably less than 0.03 ⁇ m, still more preferably 0.020 to 0. It is preferable to bond to a smooth surface of 0.025 ⁇ m.
- a protective film-forming composition is applied onto the second release film and dried as necessary to form a protective film-forming film.
- the exposed surface of the protective film-forming film has at least one surface.
- the surface having the surface roughness of the first release film having a roughness (Ra) of 0.03 to 2.0 ⁇ m is bonded. It can manufacture by bonding the exposed surface (namely, surface ((beta))) of the film for protective film formation which peeled the said 1st peeling film to the surface of the base material which is a support sheet.
- the surface roughness (Ra) of the surface of the substrate is not particularly limited, but the surface roughness (Ra) is, for example, less than 0.12 ⁇ m, more preferably less than 0.03 ⁇ m, still more preferably 0.020 to 0.
- a protective film-forming composition is applied onto the release film, and dried as necessary to form a protective film-forming film.
- the exposed surface (ie, surface ( ⁇ )) of the protective film-forming film has a surface roughness (Ra) of at least one surface of 0.03 to 2.0 ⁇ m, more preferably 0.05 to 1.8 ⁇ m, More preferably, it can be produced by bonding the substrate having a surface roughness (Ra) of 0.05 to 1.3 ⁇ m to the surface of the surface roughness (Ra).
- the composite sheet for forming a protective film of the present invention can also be produced by sequentially laminating the above-described layers so as to have a corresponding positional relationship. The method for forming each layer is as described above.
- the second composition is preferably applied to the release-treated surface of the release film.
- the release film may be removed as necessary after forming the laminated structure.
- the release film may be removed at an arbitrary timing after the target laminated structure is formed.
- a layer that employs such a process may be appropriately selected to produce a protective sheet-forming composite sheet.
- the composite sheet for forming a protective film is usually stored in a state in which a release film is bonded to the surface of the outermost layer (for example, a film for forming a protective film) opposite to the support sheet. Therefore, a composition for forming a layer constituting the outermost layer, such as a protective film-forming composition, is applied on this release film (preferably its release-treated surface) and dried as necessary.
- a release film for example, a film for forming a protective film
- each remaining layer for example, a base material that is a support sheet
- the composite sheet for forming a protective film can also be obtained by leaving the laminated film without removing the release film.
- the protective film forming film or protective film forming sheet of the present invention can be used, for example, by the following method. That is, on the back surface (surface opposite to the electrode forming surface) of the semiconductor wafer, the surface ( ⁇ ) opposite to the surface having the first release film of the protective film forming sheet is formed by the protective film forming film. Affix it. Next, the protective film-forming film is irradiated with energy rays, and the protective film-forming film is cured to form a protective film.
- the first release film is peeled off, the exposed surface (surface ( ⁇ )) of the protective film is attached to a support sheet, and the semiconductor wafer is divided together with the protective film by dicing to form semiconductor chips.
- the semiconductor chip is picked up while being separated from the support sheet while the protective film is attached (that is, as a semiconductor chip with a protective film).
- the said support sheet has a preferable support sheet which consists only of a base material.
- a support sheet used in the composite sheet for forming a protective film of the present invention can be applied.
- the semiconductor chip of the obtained semiconductor chip with a protective film is flip-chip connected to the circuit surface of the substrate in the same manner as the conventional method, and then the semiconductor package is obtained.
- the composite sheet for protective film formation of this invention can be used by the method shown below, for example. That is, the protective film-forming composite sheet is attached to the back surface (surface opposite to the electrode forming surface) of the semiconductor wafer with the protective film-forming film. Next, the protective film-forming film is irradiated with energy rays, and the protective film-forming film is cured to form a protective film. Next, the semiconductor wafer is divided together with the protective film by dicing to form semiconductor chips. Then, the semiconductor chip is picked up while being separated from the support sheet while the protective film is attached (that is, as a semiconductor chip with a protective film).
- the semiconductor chip of the obtained semiconductor chip with a protective film is flip-chip connected to the circuit surface of the substrate by the same method as the conventional method, the whole is sealed with a resin to obtain a semiconductor package. Then, a target semiconductor device may be manufactured using this semiconductor package.
- the order of performing these steps is as follows: The reverse may be possible. That is, after a protective film-forming composite sheet is attached to the back surface of the semiconductor wafer, the semiconductor wafer is divided together with the protective film-forming film by dicing to form semiconductor chips. Next, the divided protective film-forming film is irradiated with energy rays, and the protective film-forming film is cured to form a protective film. Thereafter, in the same manner as described above, the semiconductor chip with the protective film may be pulled away from the support sheet and picked up to produce the target semiconductor device.
- Energy ray curable component (a2) -1 Tricyclodecane dimethylol diacrylate (“KAYARAD R-684”, bifunctional ultraviolet curable compound, molecular weight 304, manufactured by Nippon Kayaku Co., Ltd.)
- Acrylic resin weight average molecular weight 300000, glass transition temperature ⁇ 1 ° C.
- Photopolymerization initiator (c) -1 2- (dimethylamino) -1- (4-morpholinophenyl) -2-benzyl-1-butanone (“Irgacure (registered trademark) 369” manufactured by BASF)
- the protective film-forming composition (IV) obtained above was applied to the release-treated surface of a release film (“SP-PET 381031” manufactured by Lintec Co., Ltd., thickness 38 ⁇ m) from which one side of a polyethylene terephthalate film was released by silicone treatment. -1) was coated with a knife coater and dried at 100 ° C. for 2 minutes to prepare an energy ray-curable protective film-forming film (13) -1 having a thickness of 25 ⁇ m.
- SP-PET 381031 manufactured by Lintec Co., Ltd., thickness 38 ⁇ m
- the surface having the surface roughness (Ra) of the support sheet (10) -1 which is a base material of a polypropylene film (thickness 80 ⁇ m) having a surface roughness (Ra) of 1.3 ⁇ m is obtained as described above.
- the exposed surface of the protective film forming film (13) -1 is bonded together, and the base material, the protective film forming film (13) -1 and the release film are laminated in this order in the thickness direction.
- a composite sheet for film formation was produced.
- Example 2 ⁇ Manufacture of composite sheet for forming protective film>
- the support sheet (10) -1 which is a base material of a polypropylene film (thickness 80 ⁇ m) having a surface roughness (Ra) of 1.3 ⁇ m used in Example 1, was used, and the surface roughness (Ra) was 0.05 ⁇ m.
- the protective film-forming film (13) -1 and the protective film-forming sheet were obtained in the same manner as in Example 1 except that Was made.
- Example 3 ⁇ Manufacture of composite sheet for forming protective film>
- Filler (d) -1 (2 parts by mass of the protective film-forming composition (IV-1) used in Example 1 (ie, the total mass of the solid content of the protective film-forming composition (IV-1)) 4.3% by mass) is replaced with the filler (d) -2 (5 parts by mass, ie, 10% by mass with respect to the total mass of the solid content of the protective film-forming composition (IV-1)).
- a protective film-forming film (13) -2 and a protective film-forming sheet were produced in the same manner as in Example 1.
- Example 4 ⁇ Manufacture of protective film forming sheet>
- the protective film used in Example 1 on the surface having the surface roughness (Ra) of the first release film which is a polyethylene terephthalate film (thickness 80 ⁇ m) having a surface roughness (Ra) of 1.8 ⁇ m.
- the composition (IV-1) was applied with a knife coater and dried at 100 ° C. for 2 minutes to prepare an energy ray-curable protective film-forming film (13) -1 having a thickness of 25 ⁇ m.
- the protective film formed above was formed on the release-treated surface of the second release film (“SP-PET 381031” manufactured by Lintec Corporation, thickness 38 ⁇ m) from which one side of the polyethylene terephthalate film was subjected to release treatment by silicone treatment.
- the first release film, the protective film-forming film (13) -1 and the second release film are laminated in this order in the thickness direction by bonding the exposed surfaces of the film for film (13) -1.
- a protective film-forming sheet was produced.
- the support sheet (10) -1 which is a base material of a polypropylene film (thickness 80 ⁇ m) having a surface roughness (Ra) of 1.3 ⁇ m used in Example 1, was used, and the surface roughness (Ra) was 0.025 ⁇ m.
- the support sheet (10) -3 which is a base material of a polypropylene film (thickness 80 ⁇ m)
- the protective film-forming film (13) -1 a protective film-forming sheet, was made.
- the support sheet (10) -1 which is a base material of a polypropylene film (thickness 80 ⁇ m) having a surface roughness (Ra) of 1.3 ⁇ m used in Example 1, was used, and the surface roughness (Ra) was 0.020 ⁇ m.
- the support sheet (10) -4 which is a base material of a polypropylene film (thickness 80 ⁇ m)
- the protective film-forming film (13) -1 and the protective film-forming sheet were the same as in Example 1 except that Was made.
- a protective film-forming film (13) -2 and protective film formation were carried out in the same manner as in Example 1 except that the support sheet (10) -3, which was a base material of a 0.025 ⁇ m polypropylene film (thickness 80 ⁇ m), was used. A sheet was prepared.
- the surface roughness (Ra) of the surface of the measurement object was measured at a magnification of 10 times in the PSI mode using an optical interference type surface shape measuring device (product name “WYKO WT1100” manufactured by Veeco Metrology Group).
- the surface of the protective film-forming film bonded to the base material that is the support sheet is the surface ( ⁇ )
- the protective film After the forming film was cured to form a protective film, the protective film was peeled off from the base material of the support sheet, and the surface roughness (Ra) of the surface ( ⁇ ) of the protective film was measured.
- the protective film-forming film was cured to obtain a protective film.
- the silicon wafer was diced together with the protective film to obtain individual pieces of 5 mm ⁇ 5 mm silicon chips.
- 20 silicon chips with a protective film were picked up using a die bonder (“BESTEM-D02” manufactured by Canon Machinery Co., Ltd.). At this time, the presence or absence of cracks and chips of the silicon chip was visually confirmed, and the case where there were no cracks and chips was determined as ⁇ ⁇ '', and the case where there was even a slight crack or chip was determined as ⁇ X '', Pickup suitability was evaluated. The results are shown in Table 1.
- the protective film-forming film of Examples 1 to 3 or the protective film-forming sheet of Example 4 was used, the protective film-forming film was irradiated with energy rays to When the surface roughness (Ra) of the surface ( ⁇ ) of the protective film is 0.038 ⁇ m or more, cracking and chipping of the silicon chip are suppressed at the time of pickup, and other problems are not seen, Pickup aptitude was excellent.
- the protective film-forming composite sheets of Comparative Examples 1 to 3 when the protective film-forming film was irradiated with energy rays to form a protective film, the surface of the surface of the protective film ( ⁇ ) When the roughness (Ra) was less than 0.038 ⁇ m, cracking and chipping of the silicon chip were not suppressed during pick-up, and pick-up suitability was poor.
- the protective film-forming film is laminated directly on the base material, when the protective film-forming film is cured to form a protective film, the interface between the protective film and the base material is specific. By roughening the surface, it is presumed that the adhesiveness between the protective film and the base material was appropriately adjusted to improve the pickup property. In this case, it is preferable that the support sheet is made of only the base material because the effect of roughening the protective film is likely to appear.
- the present invention can be used for manufacturing semiconductor devices.
- 1C, 1D Composite sheet 10 for protective film formation ...
- Support sheet 10a ...
- Base material 11a ...
- Films 13a, 23a ... protective film forming film surface 15 ... release film 16 ; jig adhesive layer 16a ... jig adhesive layer surface
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- Condensed Matter Physics & Semiconductors (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
Description
本願は、2016年4月28日に、日本に出願された特願2016-92009号に基づき優先権を主張し、その内容をここに援用する。
保護膜は、ダイシング工程やパッケージングの後に、半導体チップにおいてクラックが発生するのを防止するために利用される。
本発明の保護膜形成用フィルムにおいては、前記表面(β)の表面粗さ(Ra)が1.5μm以下であることが好ましい。
また、本発明は、前記保護膜形成用フィルムを支持シート上に備えてなり、前記保護膜形成用フィルムの前記表面(β)が前記支持シートに向い合っている保護膜形成用複合シートを提供する。
本発明の保護膜形成用フィルムは、エネルギー線硬化性の保護膜形成用フィルムであって、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)が0.038μm以上である。
本発明の保護膜形成用フィルムは、少なくとも一方の表面に第1の剥離フィルムを有していてもよく、他方の表面に第2の剥離フィルムを更に有していてもよい。本発明の保護膜形成用フィルムは、ロール状に巻回した長尺状フィルムとして提供することができる。
図3は、本発明の保護膜形成用フィルムの一実施形態を模式的に示す断面図である。図3では、第1の剥離フィルム15b、保護膜形成用フィルム13(23)及び第2の剥離フィルム15aが、この順で積層されている。
本明細書では、保護膜形成用フィルムにおいて、半導体ウエハの裏面(すなわち、回路面とは反対側の表面)に貼付する表面を「表面(α)」と称し、半導体ウエハの裏面に貼付される表面とは反対側の表面を「表面(β)」と称する場合がある。
本発明の保護膜形成用フィルムは、その少なくとも一方の表面(β)の表面粗さ(Ra)が0.038μm以上であることが好ましく、1.5μm以下であることが好ましい。
本発明の1つの側面は、エネルギー線硬化性を有し、半導体ウエハ又は半導体チップの裏面に保護膜を形成するための保護膜形成用フィルムであって、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、前記半導体ウエハ又は半導体チップに貼付される側の表面(α)とは反対側の表面(β)の表面粗さ(Ra)が0.038μm以上である、保護膜形成用フィルムに関する。前記半導体ウエハ又は半導体チップに貼付される側の表面(α)とは反対側の表面(β)の表面粗さ(Ra)は、1.5μm以下であることが好ましい。
本発明の別の側面は、第1の剥離フィルムと、前記第1の剥離フィルムに直接接触し、エネルギー線硬化性を有する保護膜形成用フィルムとを備えた保護膜形成用シートであって、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、前記第1の剥離フィルムに直接接触している側の表面(β)の表面粗さ(Ra)が0.038μm以上である、保護膜形成用シートに関する。前記第1の剥離フィルムに貼付されている側の表面(β)の表面粗さ(Ra)は、1.5μm以下であることが好ましい。
前記保護膜形成用フィルムの表面(β)に直接接触している第1の剥離フィルムの表面の表面粗さ(Ra)が、0.03~2.0μmであることが好ましく、0.05~1.8μmであることがより好ましい。このような表面粗さ(Ra)を有する剥離フィルムの表面に保護膜形成用フィルムを直接積層することにより、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)を0.038μm以上、1.5μm以下に調整することができる。すなわち、前記保護膜形成用フィルムの第1の剥離フィルムが貼付された側とは反対側の表面(α)を半導体ウエハ又は半導体チップの裏面に貼付し、前記保護膜形成用フィルムにエネルギー線を照射して保護膜とし、前記第1の剥離フィルムを剥離することにより、前記保護膜の表面(β)の表面粗さ(Ra)を0.038μm以上、1.5μm以下に調整することができる。
本発明の保護膜形成用フィルムにおいて、前記表面(β)の表面粗さ(Ra)は、0.038~1.5μmが好ましく、0.04~1.47μmがより好ましく、0.08~1.47μmがより好ましく、0.8~1.43μmが更に好ましい。
本明細書において、保護膜形成用フィルムの表面(β)の表面粗さ(Ra)は、実施例に記載の測定方法によって測定することができる。
本発明の保護膜形成用複合シートは、支持シート上に、エネルギー線硬化性の保護膜形成用フィルムを備えてなり、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)が0.038μm以上である。
本発明の保護膜形成用複合シートでは、前記保護膜形成用フィルムの前記表面(β)が前記支持シートに向い合っていることが好ましい。
本発明の保護膜形成用複合シートにおける前記保護膜形成用フィルムの前記表面(β)が0.038μm以上であることが好ましく、1.5μm以下であることが好ましい。また、本発明の保護膜形成用複合シートにおける前記保護膜形成用フィルムにおいて、前記表面(β)の表面粗さ(Ra)は、0.038~1.5μmが好ましく、0.04~1.47μmがより好ましく、0.08~1.47μmがより好ましく、0.8~1.43が更に好ましい。
前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜と前記支持シートとの間の粘着力が50~1500mN/25mmであってもよい。
なお、本明細書において、「保護膜形成用フィルム」とは硬化前のものを意味し、「保護膜」とは、保護膜形成用フィルムを硬化させたものを意味する。また、保護膜形成用複合シートにおける保護膜形成用フィルムの表面(β)の表面粗さ(Ra)は、実施例に記載の測定方法によって測定することができる。
また、本発明の保護膜形成用複合シートでは、前記保護膜形成用フィルムがエネルギー線硬化性であることにより、熱硬化性の保護膜形成用フィルムを備えた従来の保護膜形成用複合シートの場合よりも、短時間での硬化によって保護膜を形成できる。
紫外線は、例えば、紫外線源として高圧水銀ランプ、ヒュージョンHランプ、キセノンランプ、ブラックライト又はLEDランプ等を用いることで照射できる。電子線は、電子線加速器等によって発生させたものを照射できる。
本発明において、「エネルギー線硬化性」とは、エネルギー線を照射することにより硬化する性質を意味し、「非エネルギー線硬化性」とは、エネルギー線を照射しても硬化しない性質を意味する。
以下、本発明の構成について、詳細に説明する。
前記支持シートは、1層(単層)からなるものでもよいし、2層以上の複数層からなるものでもよい。支持シートが複数層からなる場合、これら複数層の構成材料及び厚さは、互いに同一でも異なっていてもよく、これら複数層の組み合わせは、本発明の効果を損なわない限り、特に限定されない。
なお、本明細書においては、支持シートの場合に限らず、「複数層が互いに同一でも異なっていてもよい」とは、「すべての層が同一であってもよいし、すべての層が異なっていてもよく、一部の層のみが同一であってもよい」ことを意味し、さらに「複数層が互いに異なる」とは、「各層の構成材料及び厚さの少なくとも一方が互いに異なる」ことを意味する。
ここに示す保護膜形成用複合シート1Cは、粘着剤層を備えていない。すなわち、保護膜形成用複合シート1Cにおいては、支持シート10が基材11のみからなる。そして、基材11の一方の表面11a(支持シート10の一方の表面10a)に保護膜形成用フィルム13が積層され、保護膜形成用フィルム13の表面13aの一部、すなわち、周縁部近傍の領域に治具用接着剤層16が積層され、保護膜形成用フィルム13の表面13aのうち、治具用接着剤層16が積層されていない面と、治具用接着剤層16の表面16a(上面及び側面)に、剥離フィルム15が積層されている。
ここに示す保護膜形成用複合シート1Dは、治具用接着剤層16を備えていない点以外は、図1に示す保護膜形成用複合シート1Cと同じものである。すなわち、保護膜形成用複合シート1Dにおいては、基材11の一方の表面11aに保護膜形成用フィルム13が積層され、保護膜形成用フィルム13の表面13aの全面に剥離フィルム15が積層されている。
また、本発明の保護膜形成用複合シートにおいては、剥離フィルムと、この剥離フィルムと直接接触している層との間に、一部隙間が生じていてもよい。
また、本発明の保護膜形成用複合シートにおいては、各層の大きさや形状は、目的に応じて任意に調節できる。
なかでも、保護膜形成用フィルムがエネルギー線硬化性を有する本発明においては、支持シートはエネルギー線を透過させるものが好ましい。
一方、支持シートにおいて、波長375nmの光の透過率の上限値は特に限定されないが、例えば、95%とすることが可能である。
前記光の透過率がこのような範囲であることで、支持シートを介して保護膜形成用フィルム又は保護膜にレーザー光を照射して、これらに印字したときに、より明りょうに印字できる。
一方、支持シートにおいて、波長532nmの光の透過率の上限値は特に限定されないが、例えば、95%とすることが可能である。
一方、支持シートにおいて、波長1064nmの光の透過率の上限値は特に限定されないが、例えば、95%とすることが可能である。
次に、支持シートを構成する各層について、さらに詳細に説明する。
前記基材は、シート状又はフィルム状であり、その構成材料としては、例えば、各種樹脂が挙げられる。
前記樹脂としては、例えば、低密度ポリエチレン(LDPE)、直鎖低密度ポリエチレン(LLDPE)、高密度ポリエチレン(HDPE)等のポリエチレン;ポリプロピレン、ポリブテン、ポリブタジエン、ポリメチルペンテン、ノルボルネン樹脂等のポリエチレン以外のポリオレフィン;エチレン-酢酸ビニル共重合体、エチレン-(メタ)アクリル酸共重合体、エチレン-(メタ)アクリル酸エステル共重合体、エチレン-ノルボルネン共重合体等のエチレン系共重合体(モノマーとしてエチレンを用いて得られた共重合体);ポリ塩化ビニル、塩化ビニル共重合体等の塩化ビニル系樹脂(モノマーとして塩化ビニルを用いて得られた樹脂);ポリスチレン;ポリシクロオレフィン;ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート、ポリエチレンイソフタレート、ポリエチレン-2,6-ナフタレンジカルボキシレート、すべての構成単位が芳香族環式基を有する全芳香族ポリエステル等のポリエステル;2種以上の前記ポリエステルの共重合体;ポリ(メタ)アクリル酸エステル;ポリウレタン;ポリウレタンアクリレート;ポリイミド;ポリアミド;ポリカーボネート;フッ素樹脂;ポリアセタール;変性ポリフェニレンオキシド;ポリフェニレンスルフィド;ポリスルホン;ポリエーテルケトン等が挙げられる。
また、前記樹脂としては、例えば、前記ポリエステルとそれ以外の樹脂との混合物等のポリマーアロイも挙げられる。前記ポリエステルとそれ以外の樹脂とのポリマーアロイは、ポリエステル以外の樹脂の量が比較的少量であるものが好ましい。
また、前記樹脂としては、例えば、ここまでに例示した前記樹脂の1種又は2種以上が架橋した架橋樹脂;ここまでに例示した前記樹脂の1種又は2種以上を用いたアイオノマー等の変性樹脂も挙げられる。
ここで、「基材の厚さ」とは、基材全体の厚さを意味し、例えば、複数層からなる基材の厚さとは、基材を構成するすべての層の合計の厚さを意味する。
本明細書において、「厚さ」とは、接触式厚み計で、対象物の任意の5箇所を測定し、その平均で表される値である。
そして、保護膜形成用フィルムがエネルギー線硬化性を有する本発明においては、基材はエネルギー線を透過させるものが好ましい。
また、基材は、表面がプライマー処理を施されたものであってもよい。
また、基材は、帯電防止コート層、保護膜形成用複合シートを重ね合わせて保存する際に、基材が他のシートに接着することや、基材が吸着テーブルに接着することを防止する層等を有するものであってもよい。
これらの中でも基材は、ダイシング時のブレードの摩擦による基材の断片の発生が抑制される点から、特に表面が電子線照射処理を施されたものが好ましい。
基材の表面の表面粗さ(Ra)は、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)が0.038μm以上である限り特に限定されない。
本発明の1つの側面として、基材の少なくとも一方の表面の表面粗さ(Ra)が0.03~2.0μmであることが好ましく、0.05~1.8μmであることがより好ましい。このような表面粗さ(Ra)を有する基材の表面に、剥離フィルム上に後述の保護膜形成用組成物を塗工し、必要に応じて乾燥させて形成した保護膜形成用フィルムの露出面(すなわち、表面(β))を貼り合せることにより、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)を0.038μm以上、1.5μm以下に調整することができる。
本発明の別の側面として、基材の少なくとも一方の表面の表面粗さ(Ra)が0.05~1.3μmであることが好ましい。このような表面粗さ(Ra)を有する基材の表面に、剥離フィルム上に後述の保護膜形成用組成物を塗工し、必要に応じて乾燥させて形成した保護膜形成用フィルムの露出面(すなわち、表面(β))を貼り合せることにより、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)を0.038μm以上、0.9μm以下に調整することができる。
本発明のまた別の側面として、基材の少なくとも一方の表面の表面粗さ(Ra)が0.12μm未満、より好ましくは0.03μm未満、更に好ましくは0.020~0.025μmであってもよい。このような表面粗さ(Ra)を有する基材の表面に、少なくとも一方の表面の表面粗さ(Ra)が0.03~2.0μmである第1の剥離フィルムの前記表面粗さを有する表面上に後述の保護膜形成用組成物を塗工し、必要に応じて乾燥させて保護膜形成用フィルムを形成し、前記保護膜形成用フィルムの露出面に第2の剥離フィルムを貼り合せ、前記第1の剥離フィルムを剥離した保護膜形成用フィルムの露出面(すなわち、表面(β))を貼り合せることにより、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)を0.038μm以上、0.9μm以下に調整することができる。
本発明のさらに別の側面として、基材の少なくとも一方の表面の表面粗さ(Ra)が0.12μm未満、より好ましくは0.03μm未満、更に好ましくは0.020~0.025μmであってもよい。このような表面粗さ(Ra)を有する基材の表面に、第2の剥離フィルム上に後述の保護膜形成用組成物を塗工し、必要に応じて乾燥させて保護膜形成用フィルムを形成し、前記保護膜形成用フィルムの露出面に少なくとも一方の表面の表面粗さ(Ra)が0.03~2.0μmである第1の剥離フィルムの前記表面粗さを有する表面を貼り合せ、前記第1の剥離フィルムを剥離した保護膜形成用フィルムの露出面(すなわち、表面(β))を貼り合せることにより、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)を0.038μm以上、0.9μm以下に調整することができる。
本明細書において、基材の表面の表面粗さ(Ra)は、実施例に記載の測定方法によって測定することができる。
本発明の保護膜形成用複合シートにおいて、前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)が0.038μm以上であることにより、保護膜付き半導体チップのピックアップ時に、目的外の保護膜付き半導体チップのピックアップが抑制され、目的とする保護膜付き半導体チップを高選択的にピックアップできる。また、前記粘着力が前記上限値以下であることで、保護膜付き半導体チップのピックアップ時に、半導体チップの割れ及び欠けが抑制される。また、保護膜形成用フィルムを硬化して得られた保護膜と、支持シートとの間の粘着力は、50~1500mN/25mmであることが好ましく、52~1450mN/25mm、更には53~1430mN/25mmであることがより好ましい。このように、更に前記粘着力が特定の範囲内であることで、保護膜形成用複合シートは、より良好なピックアップ適性を有する。
すなわち、幅が25mmで長さが任意の保護膜形成用複合シートをその保護膜形成用フィルムにより被着体へ貼付する。
次いで、エネルギー線を照射して保護膜形成用フィルムを硬化させて、保護膜を形成した後、被着体へ貼付されているこの保護膜から、支持シートを剥離速度300mm/minで剥離させる。このときの剥離は、保護膜及び支持シートの互いに接触していた面同士が180°の角度を為すように、支持シートをその長さ方向(保護膜形成用複合シートの長さ方向)へ剥離させる、いわゆる180°剥離とする。そして、この180°剥離のときの荷重(剥離力)を測定し、その測定値を前記粘着力(mN/25mm)とする。
一方、保護膜形成用フィルムと前記支持シートとの間の粘着力の上限値は、特に限定されず、例えば、4000mN/25mm、3500mN/25mm、3000mN/25mm等のいずれかとすることができる。ただし、これらは一例である。
エネルギー線硬化性成分(a)は、未硬化であることが好ましく、粘着性を有することが好ましく、未硬化でかつ粘着性を有することがより好ましい。
ここで、「保護膜形成用フィルムの厚さ」とは、保護膜形成用フィルム全体の厚さを意味し、例えば、複数層からなる保護膜形成用フィルムの厚さとは、保護膜形成用フィルムを構成するすべての層の合計の厚さを意味する。
例えば、保護膜形成用フィルムの硬化時における、エネルギー線の照度は、4~280mW/cm2であることが好ましい。そして、前記硬化時における、エネルギー線の光量は、3~1000mJ/cm2であることが好ましい。
保護膜形成用フィルムは、その構成材料を含有する保護膜形成用組成物を用いて形成できる。例えば、保護膜形成用フィルムの形成対象面に保護膜形成用組成物を塗工し、必要に応じて乾燥させることで、目的とする部位に保護膜形成用フィルムを形成できる。保護膜形成用組成物中の、常温で気化しない成分同士の含有量の比率は、通常、保護膜形成用フィルムの前記成分同士の含有量の比率と同じとなる。ここで、「常温」とは、特に冷やしたり、熱したりしない温度、すなわち平常の温度を意味し、例えば、15~25℃の温度等が挙げられる。
保護膜形成用組成物としては、例えば、前記エネルギー線硬化性成分(a)を含有する保護膜形成用組成物(IV-1)等が挙げられる。
エネルギー線硬化性成分(a)は、エネルギー線の照射によって硬化する成分であり、保護膜形成用フィルムに造膜性や、可撓性等を付与するための成分でもある。
エネルギー線硬化性成分(a)としては、例えば、エネルギー線硬化性基を有する、重量平均分子量が80000~2000000の重合体(a1)、及びエネルギー線硬化性基を有する、分子量が100~80000の化合物(a2)が挙げられる。前記重合体(a1)は、その少なくとも一部が、後述する架橋剤(f)によって架橋されたものであってもよいし、架橋されていないものであってもよい。
なお、本明細書において、重量平均分子量とは、特に断りのない限り、ゲル・パーミエーション・クロマトグラフィー(GPC)法により測定されるポリスチレン換算値を意味する。
エネルギー線硬化性基を有する、重量平均分子量が80000~2000000の重合体(a1)としては、例えば、他の化合物が有する基と反応可能な官能基を有するアクリル系重合体(a11)と、前記官能基と反応する基、及びエネルギー線硬化性二重結合等のエネルギー線硬化性基を有するエネルギー線硬化性化合物(a12)とが重合してなるアクリル系樹脂(a1-1)が挙げられる。
これらの中でも、前記官能基は、水酸基であることが好ましい。
前記官能基を有するアクリル系重合体(a11)としては、例えば、前記官能基を有するアクリル系モノマーと、前記官能基を有しないアクリル系モノマーと、が共重合してなるものが挙げられ、これらモノマー以外に、さらにアクリル系モノマー以外のモノマー(非アクリル系モノマー)が共重合したものであってもよい。
また、前記アクリル系重合体(a11)は、ランダム共重合体であってもよいし、ブロック共重合体であってもよい。
前記アクリル系重合体(a11)を構成する前記非アクリル系モノマーは、1種のみでもよいし、2種以上でもよく、2種以上である場合、それらの組み合わせ及び比率は任意に選択できる。
前記エネルギー線硬化性化合物(a12)は、前記アクリル系重合体(a11)が有する官能基と反応可能な基として、イソシアネート基、エポキシ基及びカルボキシ基からなる群より選択される1種又は2種以上を有するものが好ましく、前記基としてイソシアネート基を有するものがより好ましい。前記エネルギー線硬化性化合物(a12)は、例えば、前記基としてイソシアネート基を有する場合、このイソシアネート基が、前記官能基として水酸基を有するアクリル系重合体(a11)のこの水酸基と容易に反応する。
ジイソシアネート化合物又はポリイソシアネート化合物と、ヒドロキシエチル(メタ)アクリレートとの反応により得られるアクリロイルモノイソシアネート化合物;
ジイソシアネート化合物又はポリイソシアネート化合物と、ポリオール化合物と、ヒドロキシエチル(メタ)アクリレートとの反応により得られるアクリロイルモノイソシアネート化合物等が挙げられる。
これらの中でも、前記エネルギー線硬化性化合物(a12)は、2-メタクリロイルオキシエチルイソシアネートであることが好ましい。
エネルギー線硬化性基を有する、分子量が100~80000の化合物(a2)が有するエネルギー線硬化性基としては、エネルギー線硬化性二重結合を含む基が挙げられ、好ましいものとしては、(メタ)アクリロイル基、ビニル基等が挙げられる。
前記アクリレート系化合物としては、例えば、2-ヒドロキシ-3-(メタ)アクリロイルオキシプロピルメタクリレート、ポリエチレングリコールジ(メタ)アクリレート、プロポキシ化エトキシ化ビスフェノールAジ(メタ)アクリレート、2,2-ビス[4-((メタ)アクリロキシポリエトキシ)フェニル]プロパン、エトキシ化ビスフェノールAジ(メタ)アクリレート、2,2-ビス[4-((メタ)アクリロキシジエトキシ)フェニル]プロパン、9,9-ビス[4-(2-(メタ)アクリロイルオキシエトキシ)フェニル]フルオレン、2,2-ビス[4-((メタ)アクリロキシポリプロポキシ)フェニル]プロパン、トリシクロデカンジメタノールジ(メタ)アクリレート(トリシクロデカンジメチロールジ(メタ)アクリレートともいう)、1,10-デカンジオールジ(メタ)アクリレート、1,6-ヘキサンジオールジ(メタ)アクリレート、1,9-ノナンジオールジ(メタ)アクリレート、ジプロピレングリコールジ(メタ)アクリレート、トリプロピレングリコールジ(メタ)アクリレート、ポリプロピレングリコールジ(メタ)アクリレート、ポリテトラメチレングリコールジ(メタ)アクリレート、エチレングリコールジ(メタ)アクリレート、ジエチレングリコールジ(メタ)アクリレート、トリエチレングリコールジ(メタ)アクリレート、2,2-ビス[4-((メタ)アクリロキシエトキシ)フェニル]プロパン、ネオペンチルグリコールジ(メタ)アクリレート、エトキシ化ポリプロピレングリコールジ(メタ)アクリレート、2-ヒドロキシ-1,3-ジ(メタ)アクリロキシプロパン等の2官能(メタ)アクリレート;
トリス(2-(メタ)アクリロキシエチル)イソシアヌレート、ε-カプロラクトン変性トリス-(2-(メタ)アクリロキシエチル)イソシアヌレート、エトキシ化グリセリントリ(メタ)アクリレート、ペンタエリスリトールトリ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレート、ジトリメチロールプロパンテトラ(メタ)アクリレート、エトキシ化ペンタエリスリトールテトラ(メタ)アクリレート、ペンタエリスリトールテトラ(メタ)アクリレート、ジペンタエリスリトールポリ(メタ)アクリレート、ジペンタエリスリトールヘキサ(メタ)アクリレート等の多官能(メタ)アクリレート;
ウレタン(メタ)アクリレートオリゴマー等の多官能(メタ)アクリレートオリゴマー等が挙げられる。
保護膜形成用組成物(IV-1)及び保護膜形成用フィルムは、前記エネルギー線硬化性成分(a)として前記化合物(a2)を含有する場合、さらにエネルギー線硬化性基を有しない重合体(b)も含有することが好ましい。
前記重合体(b)は、その少なくとも一部が架橋剤(f)によって架橋されたものであってもよいし、架橋されていないものであってもよい。
これらの中でも、前記重合体(b)は、アクリル系重合体(以下、「アクリル系重合体(b-1)」と略記することがある)であることが好ましい。
(メタ)アクリル酸ベンジル等の(メタ)アクリル酸アラルキルエステル;
(メタ)アクリル酸ジシクロペンテニルエステル等の(メタ)アクリル酸シクロアルケニルエステル;
(メタ)アクリル酸ジシクロペンテニルオキシエチルエステル等の(メタ)アクリル酸シクロアルケニルオキシアルキルエステル等が挙げられる。
前記水酸基含有(メタ)アクリル酸エステルとしては、例えば、(メタ)アクリル酸ヒドロキシメチル、(メタ)アクリル酸2-ヒドロキシエチル、(メタ)アクリル酸2-ヒドロキシプロピル、(メタ)アクリル酸3-ヒドロキシプロピル、(メタ)アクリル酸2-ヒドロキシブチル、(メタ)アクリル酸3-ヒドロキシブチル、(メタ)アクリル酸4-ヒドロキシブチル等が挙げられる。
前記置換アミノ基含有(メタ)アクリル酸エステルとしては、例えば、(メタ)アクリル酸N-メチルアミノエチル等が挙げられる。
前記反応性官能基は、架橋剤(f)の種類等に応じて適宜選択すればよく、特に限定されない。例えば、架橋剤(f)がポリイソシアネート化合物である場合には、前記反応性官能基としては、水酸基、カルボキシ基、アミノ基等が挙げられ、これらの中でも、イソシアネート基との反応性が高い水酸基が好ましい。また、架橋剤(f)がエポキシ系化合物である場合には、前記反応性官能基としては、カルボキシ基、アミノ基、アミド基等が挙げられ、これらの中でもエポキシ基との反応性が高いカルボキシ基が好ましい。ただし、半導体ウエハや半導体チップの回路の腐食を防止するという点では、前記反応性官能基はカルボキシ基以外の基であることが好ましい。
本発明の1つの側面は、前記溶媒以外の成分の総含有量に対する、前記エネルギー線硬化性成分(a)及びエネルギー線硬化性基を有しない重合体(b)の合計含有量の割合が、78~92質量%であることが好ましく、82~91質量%であることがより好ましく、84~90質量%であることが更に好ましい。
光重合開始剤(c)としては、例えば、ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル、ベンゾインイソブチルエーテル、ベンゾイン安息香酸、ベンゾイン安息香酸メチル、ベンゾインジメチルケタール等のベンゾイン化合物;アセトフェノン、2-ヒドロキシ-2-メチル-1-フェニル-プロパン-1-オン、2,2-ジメトキシ-1,2-ジフェニルエタン-1-オン等のアセトフェノン化合物;ビス(2,4,6-トリメチルベンゾイル)フェニルフォスフィンオキサイド、2,4,6-トリメチルベンゾイルジフェニルフォスフィンオキサイド等のアシルフォスフィンオキサイド化合物;ベンジルフェニルスルフィド、テトラメチルチウラムモノスルフィド等のスルフィド化合物;1-ヒドロキシシクロヘキシルフェニルケトン等のα-ケトール化合物;アゾビスイソブチロニトリル等のアゾ化合物;チタノセン等のチタノセン化合物;チオキサントン等のチオキサントン化合物;ベンゾフェノン、2-(ジメチルアミノ)-1-(4-モルホリノフェニル)-2-ベンジル-1-ブタノン、エタノン,1-[9-エチル-6-(2-メチルベンゾイル)-9H-カルバゾール-3-イル]-,1-(O-アセチルオキシム)等のベンゾフェノン化合物;パーオキサイド化合物;ジアセチル等のジケトン化合物;ベンジル;ジベンジル;2,4-ジエチルチオキサントン;1,2-ジフェニルメタン;2-ヒドロキシ-2-メチル-1-[4-(1-メチルビニル)フェニル]プロパノン;2-クロロアントラキノン等が挙げられる。
また、光重合開始剤(c)としては、例えば、1-クロロアントラキノン等のキノン化合物;アミン等の光増感剤等を用いることもできる。
保護膜形成用フィルムが充填材(d)を含有することにより、保護膜形成用フィルムを硬化して得られた保護膜は、熱膨張係数の調整が容易となり、この熱膨張係数を保護膜の形成対象物に対して最適化することで、保護膜形成用複合シートを用いて得られたパッケージの信頼性がより向上する。また、保護膜形成用フィルムが充填材(d)を含有することにより、保護膜の吸湿率を低減したり、放熱性を向上させたりすることもできる。
充填材(d)としては、例えば、熱伝導性材料からなるものが挙げられる。
好ましい無機充填材としては、例えば、シリカ、アルミナ、タルク、炭酸カルシウム、チタンホワイト、ベンガラ、炭化ケイ素、窒化ホウ素等の粉末;これら無機充填材を球形化したビーズ;これら無機充填材の表面改質品;これら無機充填材の単結晶繊維;ガラス繊維等が挙げられる。
これらの中でも、無機充填材は、シリカ又はアルミナであることが好ましく、表面をエポキシ基で修飾したシリカがより好ましい。
なお、本明細書において「平均粒子径」とは、特に断りのない限り、レーザー回折散乱法によって求められた粒度分布曲線における、積算値50%での粒子径(D50)の値を意味する。
本発明の1つの側面として、充填材(d)の含有量が、保護膜形成用フィルムの質量に対して4~15質量%であることが好ましく、4~10質量%であることがより好ましい。
本発明の別の側面として、充填材(d)の平均粒子径が0.05~0.1μmであるとき、充填材(d)の含有量が、保護膜形成用フィルムの質量に対して4~15質量%であることが好ましく、4~10質量%であることがより好ましい。
カップリング剤(e)として、無機化合物又は有機化合物と反応可能な官能基を有するものを用いることにより、保護膜形成用フィルムの被着体に対する接着性及び密着性を向上させることができる。また、カップリング剤(e)を用いることで、保護膜形成用フィルムを硬化して得られた保護膜は、耐熱性を損なうことなく、耐水性が向上する。
好ましい前記シランカップリング剤としては、例えば、3-グリシジルオキシプロピルトリメトキシシラン、3-グリシジルオキシプロピルメチルジエトキシシラン、3-グリシジルオキシプロピルトリエトキシシラン、3-グリシジルオキシメチルジエトキシシラン、2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン、3-メタクリロイルオキシプロピルトリメトキシシラン、3-アミノプロピルトリメトキシシラン、3-(2-アミノエチルアミノ)プロピルトリメトキシシラン、3-(2-アミノエチルアミノ)プロピルメチルジエトキシシラン、3-(フェニルアミノ)プロピルトリメトキシシラン、3-アニリノプロピルトリメトキシシラン、3-ウレイドプロピルトリエトキシシラン、3-メルカプトプロピルトリメトキシシラン、3-メルカプトプロピルメチルジメトキシシラン、ビス(3-トリエトキシシリルプロピル)テトラスルファン、メチルトリメトキシシラン、メチルトリエトキシシラン、ビニルトリメトキシシラン、ビニルトリアセトキシシラン、イミダゾールシラン等が挙げられる。
架橋剤(F)を用いて、上述のエネルギー線硬化性成分(a)やエネルギー線硬化性基を有しない重合体(b)架橋することにより、保護膜形成用フィルムの初期接着力及び凝集力を調節できる。
着色剤(g)としては、例えば、無機系顔料、有機系顔料、有機系染料等、公知のものが挙げられる。
保護膜形成用組成物(IV-1)及び保護膜形成用フィルムが含有する熱硬化性成分(h)は、1種のみでもよいし、2種以上でもよく、2種以上である場合、それらの組み合わせ及び比率は任意に選択できる。
エポキシ系熱硬化性樹脂は、エポキシ樹脂(h1)及び熱硬化剤(h2)からなる。
保護膜形成用組成物(IV-1)及び保護膜形成用フィルムが含有するエポキシ系熱硬化性樹脂は、1種のみでもよいし、2種以上でもよく、2種以上である場合、それらの組み合わせ及び比率は任意に選択できる。
エポキシ樹脂(h1)としては、公知のものが挙げられ、例えば、多官能系エポキシ樹脂、ビフェニル化合物、ビスフェノールAジグリシジルエーテル及びその水添物、オルソクレゾールノボラックエポキシ樹脂、ジシクロペンタジエン型エポキシ樹脂、ビフェニル型エポキシ樹脂、ビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、フェニレン骨格型エポキシ樹脂等、2官能以上のエポキシ化合物が挙げられる。
また、不飽和炭化水素基を有するエポキシ樹脂としては、例えば、エポキシ樹脂を構成する芳香環等に、不飽和炭化水素基を有する基が直接結合した化合物等が挙げられる。
不飽和炭化水素基は、重合性を有する不飽和基であり、その具体的な例としては、エテニル基(ビニル基ともいう)、2-プロペニル基(アリル基ともいう)、(メタ)アクリロイル基、(メタ)アクリルアミド基等が挙げられ、アクリロイル基が好ましい。
本明細書において、「数平均分子量」は、特に断らない限り、ゲルパーミエーションクロマトグラフィー(GPC)法によって測定される標準ポリスチレン換算の値で表される数平均分子量を意味する。
エポキシ樹脂(h1)のエポキシ当量は、100~1000g/eqであることが好ましく、150~800g/eqであることがより好ましい。
本明細書において、「エポキシ当量」とは1グラム当量のエポキシ基を含むエポキシ化合物のグラム数(g/eq)を意味し、JIS K 7236:2001の方法に従って測定することができる。
熱硬化剤(h2)は、エポキシ樹脂(h1)に対する硬化剤として機能する。
熱硬化剤(h2)としては、例えば、1分子中にエポキシ基と反応し得る官能基を2個以上有する化合物が挙げられる。前記官能基としては、例えば、フェノール性水酸基、アルコール性水酸基、アミノ基、カルボキシ基、酸基が無水物化された基等が挙げられ、フェノール性水酸基、アミノ基、又は酸基が無水物化された基であることが好ましく、フェノール性水酸基又はアミノ基であることがより好ましい。
熱硬化剤(h2)のうち、アミノ基を有するアミン系硬化剤としては、例えば、ジシアンジアミド(以下、「DICY」と略記することがある)等が挙げられる。
不飽和炭化水素基を有する熱硬化剤(h2)としては、例えば、フェノール樹脂の水酸基の一部が、不飽和炭化水素基を有する基で置換されてなる化合物、フェノール樹脂の芳香環に、不飽和炭化水素基を有する基が直接結合してなる化合物等が挙げられる。
熱硬化剤(h2)における前記不飽和炭化水素基は、上述の不飽和炭化水素基を有するエポキシ樹脂における不飽和炭化水素基と同様のものである。
本明細書において「ガラス転移温度」とは、示差走査熱量計を用いて、試料のDSC曲線を測定し、得られたDSC曲線の変曲点の温度で表される。
熱硬化剤(h2)のうち、例えば、ビフェノール、ジシアンジアミド等の非樹脂成分の分子量は、特に限定されないが、例えば、60~500であることが好ましい。
汎用添加剤(z)は、公知のものでよく、目的に応じて任意に選択でき、特に限定されないが、好ましいものとしては、例えば、可塑剤、帯電防止剤、酸化防止剤、ゲッタリング剤等が挙げられる。
汎用添加剤(z)を用いる場合、保護膜形成用組成物(IV-1)及び保護膜形成用フィルムの汎用添加剤(z)の含有量は、特に限定されず、目的に応じて適宜選択すればよい。
保護膜形成用組成物(IV-1)は、さらに溶媒を含有することが好ましい。溶媒を含有する保護膜形成用組成物(IV-1)は、取り扱い性が良好となる。
前記溶媒は特に限定されないが、好ましいものとしては、例えば、トルエン、キシレン等の炭化水素;メタノール、エタノール、2-プロパノール、イソブチルアルコール(2-メチルプロパン-1-オールともいう)、1-ブタノール等のアルコール;酢酸エチル等のエステル;アセトン、メチルエチルケトン等のケトン;テトラヒドロフラン等のエーテル;ジメチルホルムアミド、N-メチルピロリドン等のアミド(アミド結合を有する化合物)等が挙げられる。
保護膜形成用組成物(IV-1)が含有する溶媒は、1種のみでもよいし、2種以上でもよく、2種以上である場合、それらの組み合わせ及び比率は任意に選択できる。
本発明の1つの側面は、保護膜形成用組成物(IV-1)が、エネルギー線硬化性成分(a2)として、トリシクロデカンジメチロールジアクリレート(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して37~45質量%、より好ましくは40~43質量%)を;重合体(b)として、アクリル酸ブチル由来の構成単位(アクリル系樹脂の質量に対して、8~12質量%、より好ましくは10質量%)、アクリル酸メチル由来の構成単位(アクリル系樹脂の質量に対して、68~72質量%、より好ましくは70質量%)、メタクリル酸グリシジル由来の構成単位(アクリル系樹脂の質量に対して、3~7質量%、より好ましくは5質量%)及びアクリル酸-2-ヒドロキシエチル由来の構成単位(アクリル系樹脂の質量に対して、13~17質量%、より好ましくは15質量%)からなるアクリル系樹脂(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して41~50質量%、より好ましくは44~47質量%)を;光重合開始剤(c)として、2-(ジメチルアミノ)-1-(4-モルホリノフェニル)-2-ベンジル-1-ブタノン(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して0.2~1.1質量%、より好ましくは0.6~0.64質量%)及びエタノン,1-[9-エチル-6-(2-メチルベンゾイル)-9H-カルバゾール-3-イル]-,1-(O-アセチルオキシム)(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して0.2~1.1質量%、より好ましくは0.6~0.64質量%)を;充填材(d)として、シリカフィラー(表面修飾基:エポキシ基)(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して2.1~13.5質量%、より好ましくは4.2~10質量%)を;カップリング剤(e)として、3-メタクリロキシプロピルトリメトキシシラン(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して0.4~1.5質量%、より好ましくは0.8~0.86質量%)を;並びに着色剤(g)として、フタロシアニン系青色色素、イソインドリノン系黄色色素及びアントラキノン系赤色色素と、スチレンアクリル樹脂とを含む顔料(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して2.0~6.25質量%、より好ましくは4.0~4.3質量%)、を含む(ただし、各成分の含有量の和は、保護膜形成用組成物(IV-1)の固形分の総質量に対して100質量%を超えない)。
保護膜形成用組成物(IV-1)等の保護膜形成用組成物は、これを構成するための各成分を配合することで得られる。
各成分の配合時における添加順序は特に限定されず、2種以上の成分を同時に添加してもよい。
溶媒を用いる場合には、溶媒を溶媒以外のいずれかの配合成分と混合してこの配合成分を予め希釈しておくことで用いてもよいし、溶媒以外のいずれかの配合成分を予め希釈しておくことなく、溶媒をこれら配合成分と混合することで用いてもよい。
配合時に各成分を混合する方法は特に限定されず、撹拌子又は撹拌翼等を回転させて混合する方法;ミキサーを用いて混合する方法;超音波を加えて混合する方法等、公知の方法から適宜選択すればよい。
各成分の添加及び混合時の温度並びに時間は、各配合成分が劣化しない限り特に限定されず、適宜調節すればよいが、温度は15~30℃であることが好ましい。
しかし、ダイシングダイボンディングシートが備える接着剤層は、半導体チップとともに支持シートからピックアップされた後、この半導体チップを基板、リードフレーム、又は他の半導体チップ等に取り付ける際の接着剤として機能する。一方、本発明の保護膜形成用複合シートにおける保護膜形成用フィルムは、半導体チップとともに支持シートからピックアップされる点では前記接着剤層と同じであるが、最終的には硬化によって保護膜となり、貼付されている半導体チップの裏面を保護するという機能を有する。このように、本発明における保護膜形成用フィルムは、ダイシングダイボンディングシートにおける接着剤層とは、用途が異なり、求められる性能も当然に異なる。そして、この用途の違いを反映して、保護膜形成用フィルムは、通常、ダイシングダイボンディングシートにおける接着剤層と比較すると、硬めで、ピックアップが難しい傾向にある。したがって、ダイシングダイボンディングシートにおける接着剤層を、そのまま保護膜形成用複合シートにおける保護膜形成用フィルムとして転用することは、通常、困難である。本発明の保護膜形成用複合シートは、エネルギー線硬化性の保護膜形成用フィルムを備えたものとしては、保護膜付き半導体チップのピックアップ適性に関して、従来になく極めて優れたものである。
<保護膜形成用フィルムの製造方法(1)>
本発明の保護膜形成用フィルムの製造方法の第1の態様は、剥離フィルム(第2の剥離フィルムと称する場合がある)上に保護膜形成用組成物を塗工し、必要に応じて乾燥させて保護膜形成用フィルムを形成し、前記保護膜形成用フィルムの露出面(すなわち、表面(β))に少なくとも一方の表面の表面粗さ(Ra)が0.03~2.0μmである第1の剥離フィルムの前記表面粗さを有する表面を貼り合せることで製造することができる。
この場合、前記第1の剥離フィルムの表面の表面粗さ(Ra)が、0.03~1.8μmであることが好ましい。
本明細書において、剥離フィルムを備えた保護膜形成用フィルムを、「保護膜形成用シート」と称する場合がある。
<保護膜形成用フィルムの製造方法(2)>
本発明の保護膜形成用フィルムの製造方法の第2の態様は、少なくとも一方の表面の表面粗さ(Ra)が0.03~2.0μmである剥離フィルム(第1の剥離フィルムと称する場合がある)の前記表面粗さを有する表面上に保護膜形成用組成物を塗工し、必要に応じて乾燥させることで製造することができる。この場合、前記第1の剥離フィルムの表面の表面粗さ(Ra)が、0.03~1.8μmであることが好ましい。また、本発明の保護膜形成用フィルムは、上記のように製造した保護膜形成用フィルムにおいて、前記第1の剥離フィルムを貼付した表面とは反対側の表面(すなわち、表面(α))に別の剥離フィルム(第2の剥離フィルムと称する場合がある)を貼付してもよい。
本明細書において、剥離フィルムを備えた保護膜形成用フィルムを、「保護膜形成用シート」と称する場合がある。
本発明の1つの側面は、保護膜形成用フィルムが、エネルギー線硬化性成分(a2)として、トリシクロデカンジメチロールジアクリレート(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して37~45質量%、より好ましくは40~43質量%)を;重合体(b)として、アクリル酸ブチル由来の構成単位(アクリル系樹脂の質量に対して、8~12質量%、より好ましくは10質量%)、アクリル酸メチル由来の構成単位(アクリル系樹脂の質量に対して、68~72質量%、より好ましくは70質量%)、メタクリル酸グリシジル由来の構成単位(アクリル系樹脂の質量に対して、3~7質量%、より好ましくは5質量%)及びアクリル酸-2-ヒドロキシエチル由来の構成単位(アクリル系樹脂の質量に対して、13~17質量%、より好ましくは15質量%)からなるアクリル系樹脂(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して41~50質量%、より好ましくは44~47質量%)を;光重合開始剤(c)として、2-(ジメチルアミノ)-1-(4-モルホリノフェニル)-2-ベンジル-1-ブタノン(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して0.2~1.1質量%、より好ましくは0.6~0.64質量%)及びエタノン,1-[9-エチル-6-(2-メチルベンゾイル)-9H-カルバゾール-3-イル]-,1-(O-アセチルオキシム)(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して0.2~1.1質量%、より好ましくは0.6~0.64質量%)を;充填材(d)として、シリカフィラー(表面修飾基:エポキシ基)(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して2.1~13.5質量%、より好ましくは4.2~10質量%)を;カップリング剤(e)として、3-メタクリロキシプロピルトリメトキシシラン(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して0.4~1.5質量%、より好ましくは0.8~0.86質量%)を;並びに着色剤(g)として、フタロシアニン系青色色素、イソインドリノン系黄色色素及びアントラキノン系赤色色素と、スチレンアクリル樹脂とを含む顔料(含有量:保護膜形成用組成物(IV-1)の固形分の総質量に対して2.0~6.25質量%、より好ましくは4.0~4.3質量%)、を含む(ただし、各成分の含有量の和は、保護膜形成用組成物(IV-1)の固形分の総質量に対して100質量%を超えない)。
<保護膜形成用複合シートの製造方法(1)>
本発明の保護膜形成用複合シートの製造方法の第1の態様を以下に説明する。
少なくとも一方の表面の表面粗さ(Ra)が0.03~2.0μmである剥離フィルム(第1の剥離フィルムと称する場合がある)の前記表面粗さを有する表面上に保護膜形成用組成物を塗工し、必要に応じて乾燥させることで保護膜形成用フィルムを形成し、前記保護膜形成用フィルムの露出面に第2の剥離フィルムを貼り合せる。
前記第1の剥離フィルムを剥離した保護膜形成用フィルムの露出面(すなわち、表面(β))を、支持シートである基材の表面に貼り合せることで製造することができる。前記基材の表面の表面粗さ(Ra)は特に限定されないが、前記表面粗さ(Ra)が、例えば、0.12μm未満、より好ましくは0.03μm未満、更に好ましくは0.020~0.025μmの平滑な面に貼り合せることが好ましい。
<保護膜形成用複合シートの製造方法(2)>
本発明の保護膜形成用複合シートの製造方法の第2の態様を以下に説明する。
第2の剥離フィルム上に保護膜形成用組成物を塗工し、必要に応じて乾燥させて保護膜形成用フィルムを形成し、前記保護膜形成用フィルムの露出面に少なくとも一方の表面の表面粗さ(Ra)が0.03~2.0μmである第1の剥離フィルムの前記表面粗さを有する表面を貼り合せる。
前記第1の剥離フィルムを剥離した保護膜形成用フィルムの露出面(すなわち、表面(β))を、支持シートである基材の表面に貼り合せることで製造することができる。前記基材の表面の表面粗さ(Ra)は特に限定されないが、前記表面粗さ(Ra)が、例えば、0.12μm未満、より好ましくは0.03μm未満、更に好ましくは0.020~0.025μmの平滑な面に貼り合せることが好ましい。
<保護膜形成用複合シートの製造方法(3)>
本発明の保護膜形成用複合シートの製造方法の第3の態様を以下に説明する。
剥離フィルム上に保護膜形成用組成物を塗工し、必要に応じて乾燥させて保護膜形成用フィルムを形成する。
前記保護膜形成用フィルムの露出面(すなわち、表面(β))を、少なくとも一方の表面の表面粗さ(Ra)が0.03~2.0μm、より好ましくは0.05~1.8μm、さらに好ましくは0.05~1.3μmである表面粗さ(Ra)を有する基材の前記表面粗さ(Ra)の表面に貼り合せることで製造することができる。
本発明の保護膜形成用複合シートは、上述の各層を対応する位置関係となるように順次積層することでも製造できる。各層の形成方法は、先に説明したとおりである。
剥離フィルムは目的とする積層構造を形成後の任意のタイミングで取り除けばよい。
本発明の保護膜形成用フィルム又は保護膜形成用シートは、例えば、以下に示す方法で使用できる。
すなわち、半導体ウエハの裏面(電極形成面とは反対側の面)に、保護膜形成用シートの第1の剥離フィルムを有する面とは反対側の表面(α)をその保護膜形成用フィルムによって貼付する。次いで、保護膜形成用フィルムにエネルギー線を照射して、保護膜形成用フィルムを硬化させて保護膜とする。次いで、第1剥離フィルムを剥離し、前記保護膜の露出面(表面(β))を支持シートに貼付し、ダイシングによって、半導体ウエハを保護膜ごと分割して半導体チップとする。そして、半導体チップを、この保護膜が貼付された状態のまま(すなわち、保護膜付き半導体チップとして)、支持シートから引き離してピックアップする。本明細書においては、前記支持シートは基材のみからなる支持シートが好ましい。ここで、支持シートとしては、本発明の保護膜形成用複合シートで使用される支持シートを適用することができる。
以降は従来法と同様の方法で、得られた保護膜付き半導体チップの半導体チップを基板の回路面にフリップチップ接続した後、半導体パッケージとする。そして、この半導体パッケージを用いて、目的とする半導体装置を作製すればよい。
本発明の保護膜形成用複合シートは、例えば、以下に示す方法で使用できる。
すなわち、半導体ウエハの裏面(電極形成面とは反対側の面)に、保護膜形成用複合シートをその保護膜形成用フィルムによって貼付する。次いで、保護膜形成用フィルムにエネルギー線を照射して、保護膜形成用フィルムを硬化させて保護膜とする。次いで、ダイシングによって、半導体ウエハを保護膜ごと分割して半導体チップとする。そして、半導体チップを、この保護膜が貼付された状態のまま(すなわち、保護膜付き半導体チップとして)、支持シートから引き離してピックアップする。
以降は従来法と同様の方法で、得られた保護膜付き半導体チップの半導体チップを基板の回路面にフリップチップ接続した後、全体を樹脂により封止することで、半導体パッケージとする。そして、この半導体パッケージを用いて、目的とする半導体装置を作製すればよい。
・エネルギー線硬化性成分
(a2)-1:トリシクロデカンジメチロールジアクリレート(日本化薬社製「KAYARAD R-684」、2官能紫外線硬化性化合物、分子量304)
・エネルギー線硬化性基を有しない重合体
(b)-1:アクリル酸ブチル(以下、「BA」と略記する)(10質量部)、アクリル酸メチル(以下、「MA」と略記する)(70質量部)、メタクリル酸グリシジル(以下、「GMA」と略記する)(5質量部)及びアクリル酸-2-ヒドロキシエチル(以下、「HEA」と略記する)(15質量部)を共重合してなるアクリル系樹脂(重量平均分子量300000、ガラス転移温度-1℃)。
・光重合開始剤
(c)-1:2-(ジメチルアミノ)-1-(4-モルホリノフェニル)-2-ベンジル-1-ブタノン(BASF社製「Irgacure(登録商標)369」)
(c)-2:エタノン,1-[9-エチル-6-(2-メチルベンゾイル)-9H-カルバゾール-3-イル]-,1-(O-アセチルオキシム)(BASF社製「Irgacure(登録商標)OXE02」)
・充填材
(d)-1:シリカフィラー(表面修飾基:エポキシ基)(平均粒子径0.1μm)
(d)-2:シリカフィラー(表面修飾基:エポキシ基)(平均粒子径0.05μm)・カップリング剤
(e)-1:3-メタクリロキシプロピルトリメトキシシラン(信越化学工業社製「KBM-503」、シランカップリング剤)
・着色剤
(g)-1:フタロシアニン系青色色素(Pigment Blue 15:3)32質量部と、イソインドリノン系黄色色素(Pigment Yellow 139)18質量部と、アントラキノン系赤色色素(Pigment Red 177)50質量部とを混合し、前記3種の色素の合計量/スチレンアクリル樹脂量=1/3(質量比)となるように顔料化して得られた顔料。
<保護膜形成用複合シートの製造>
(保護膜形成用組成物(IV-1)の製造)
エネルギー線硬化性成分(a2)-1(20質量部)、重合体(b)-1(22質量部)、光重合開始剤(c)-1(0.3質量部)、光重合開始剤(c)-2(0.3質量部)、充填材(d)-1(2質量部、すなわち、保護膜形成用組成物(IV-1)の固形分の総質量に対して4.3質量%)、カップリング剤(e)-1(0.4質量部)及び着色剤(g)-1(2質量部)を、メチルエチルケトンに溶解又は分散させて、23℃で撹拌することで、固形分濃度が50質量%である保護膜形成用組成物(IV-1)を調製した。
ポリエチレンテレフタレート製フィルムの片面がシリコーン処理により剥離処理された剥離フィルム(リンテック社製「SP-PET381031」、厚さ38μm)の前記剥離処理面に、上記で得られた保護膜形成用組成物(IV-1)をナイフコーターにより塗工し、100℃で2分乾燥させることにより、厚さ25μmのエネルギー線硬化性の保護膜形成用フィルム(13)-1を作製した。
<保護膜形成用複合シートの製造>
実施例1で用いた表面粗さ(Ra)が1.3μmのポリプロピレン系フィルム(厚さ80μm)の基材である支持シート(10)-1を、表面粗さ(Ra)が0.05μmのポリプロピレン系フィルム(厚さ80μm)の基材である支持シート(10)-2に替え、他は実施例1と同様にして保護膜形成用フィルム(13)-1と、保護膜形成用シートとを作製した。
<保護膜形成用複合シートの製造>
実施例1で用いた保護膜形成用組成物(IV-1)の充填材(d)-1(2質量部、すなわち、保護膜形成用組成物(IV-1)の固形分の総質量に対して4.3質量%)を、充填材(d)-2(5質量部、すなわち、保護膜形成用組成物(IV-1)の固形分の総質量に対して10質量%)に替え、他は実施例1と同様にして保護膜形成用フィルム(13)-2と、保護膜形成用シートとを作製した。
<保護膜形成用シートの製造>
表面粗さ(Ra)が1.8μmのポリエチレンテレフタレート製フィルム(厚さ80μm)である第1の剥離フィルムの前記表面粗さ(Ra)を有する表面に、実施例1で用いた保護膜形成用組成物(IV-1)をナイフコーターにより塗工し、100℃で2分乾燥させることにより、厚さ25μmのエネルギー線硬化性の保護膜形成用フィルム(13)-1を作製した。
[比較例1]
<保護膜形成用複合シートの製造>
実施例1で用いた表面粗さ(Ra)が1.3μmのポリプロピレン系フィルム(厚さ80μm)の基材である支持シート(10)-1を、表面粗さ(Ra)が0.025μmのポリプロピレン系フィルム(厚さ80μm)の基材である支持シート(10)-3に替え、他は実施例1と同様にして保護膜形成用フィルム(13)-1と、保護膜形成用シートとを作製した。
[比較例2]
<保護膜形成用複合シートの製造>
実施例1で用いた表面粗さ(Ra)が1.3μmのポリプロピレン系フィルム(厚さ80μm)の基材である支持シート(10)-1を、表面粗さ(Ra)が0.020μmのポリプロピレン系フィルム(厚さ80μm)の基材である支持シート(10)-4に替え、他は実施例1と同様にして保護膜形成用フィルム(13)-1と、保護膜形成用シートとを作製した。
[比較例3]
<保護膜形成用複合シートの製造>
実施例1で用いた保護膜形成用組成物(IV-1)の充填材(d)-1(2質量部、すなわち、保護膜形成用組成物(IV-1)の固形分の総質量に対して4.3質量%)を、充填材(d)-2(5質量部、すなわち、保護膜形成用組成物(IV-1)の固形分の総質量に対して10質量%)に替え、また、実施例1で用いた表面粗さ(Ra)が1.3μmのポリプロピレン系フィルム(厚さ80μm)の基材である支持シート(10)-1を、表面粗さ(Ra)が0.025μmのポリプロピレン系フィルム(厚さ80μm)の基材である支持シート(10)-3に替え、他は実施例1と同様にして保護膜形成用フィルム(13)-2と、保護膜形成用シートとを作製した。
光干渉式表面形状測定装置(Veeco Metrology Group社製、製品名「WYKO WT1100」)を用いて、PSIモードで倍率10倍にて、測定対象の表面の表面粗さ(Ra)を測定した。
実施例1~3、及び比較例1~3の保護膜形成用複合シートについては、支持シートである基材に貼り合せられている保護膜形成用フィルムの表面を表面(β)とし、保護膜形成用フィルムを硬化させて保護膜とした後、支持シートの基材から保護膜を剥がし、前記保護膜の前記表面(β)の表面粗さ(Ra)を測定した。また、支持シートである基材の表面粗さ(Ra)については、保護膜形成用フィルムを貼り合せる前に測定した。
その結果を表1に示す。
(1)8インチシリコンウエハ(厚さ100μm)の#2000研磨面に、実施例1~3、及び比較例1~3で得られた保護膜形成用複合シートをその保護膜形成用フィルムの露出面(すなわち表面(α))によって貼付し、さらにこのシートをリングフレームに固定して、30分静置した。
次いで、紫外線照射装置(リンテック社製「RAD2000m/8)を用いて、照度195mW/cm2、光量170mJ/cm2の条件で、前記支持シート側から保護膜形成用複合シートに紫外線を照射することで、前記保護膜形成用フィルムを硬化させ、保護膜とした。
次いで、ダイシングブレードを用いて、シリコンウエハを保護膜ごとダイシングして個片化し、5mm×5mmのシリコンチップを得た。
次いで、ダイボンダー(キャノンマシナリー社製「BESTEM-D02」)を用いて、20個の保護膜付きシリコンチップをピックアップした。このとき、シリコンチップの割れ及び欠けの有無を目視で確認し、割れ及び欠けが全くなかった場合を「○」と判定し、割れ又は欠けが僅かでもあった場合を「×」と判定し、ピックアップ適性を評価した。
その結果を表1に示す。
(2)8インチシリコンウエハ(厚さ100μm)の#2000研磨面に、実施例4で得られた保護膜形成用シートの第2の剥離フィルムを剥離し、保護膜形成用フィルム(13)-1の露出面(すなわち表面(α))によって貼付し、さらにこのシートの第1の剥離フィルムを剥離し、保護膜形成用フィルムの露出面(すなわち表面(β))を、比較例2で用いた支持シート(10)-3に貼り合せ、これをリングフレームに固定して、30分静置した。
その後の工程は、上記(1)に記載の工程と同様にして20個の保護膜付きシリコンチップをピックアップした。
その結果を表2に示す。
上記態様では、基材の上に直接保護膜形成用フィルムが積層されているので、前記保護膜形成用フィルムを硬化して保護膜としたとき、前記保護膜と基材との界面が特定の範囲で粗面化されることにより、前記保護膜と基材との粘着力が適度に調整されてピックアップ性が向上したからであると推測される。この場合、支持シートが基材のみからなることにより、前記保護膜の粗面化の効果が表れやすいので好ましい。
10・・・支持シート
10a・・・支持シートの表面
11・・・基材
11a・・・基材の表面
13,23・・・保護膜形成用フィルム
13a,23a・・・保護膜形成用フィルムの表面
15・・・剥離フィルム
16・・・治具用接着剤層
16a・・・治具用接着剤層の表面
Claims (3)
- エネルギー線硬化性の保護膜形成用フィルムであって、
前記保護膜形成用フィルムにエネルギー線を照射して保護膜としたとき、前記保護膜の、少なくとも一方の表面(β)の表面粗さ(Ra)が0.038μm以上である、保護膜形成用フィルム。 - 前記表面粗さ(Ra)が1.5μm以下である、請求項1に記載の保護膜形成用フィルム。
- 請求項1又は2に記載の保護膜形成用フィルムを支持シート上に備えてなり、前記保護膜形成用フィルムの前記表面(β)が前記支持シートに向い合っている保護膜形成用複合シート。
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